Dr SANGEETHA KAIMAL - Academia.edu (original) (raw)
Papers by Dr SANGEETHA KAIMAL
International journal of scientific research, Mar 1, 2016
JOURNAL OF ADVANCED APPLIED SCIENTIFIC RESEARCH, Dec 15, 2021
Post embryonic development of Oligonychus biharensis (Hirst) was traced on cow pea in the laborat... more Post embryonic development of Oligonychus biharensis (Hirst) was traced on cow pea in the laboratory at 30 + 2 o C & 70 + 5% RH. Rearing of the life stages of the mite was carried out following leaf flotation technique. The life cycle of the species was found to comprise both sexual and parthenogenetic generations with slight variations in their respective durations. The respective durations of pre -oviposition period, oviposition period and post -oviposition period were found to be 1.5 days, 11.5 + 0.75 days and 0.9 + 0.25 day. Ovipositional rate of the species was observed to be 50.9 + 4.7 eggs and 40.2 + 1.4 eggs for mated and unmated females respectively. Total duration of sexual development and parthenogenetic development was observed to be 6.45 + 0.05 days and 6.0 + 0.07 days respectively. The sex ratio (male: female) was 1-2: 10.
UTTAR PRADESH JOURNAL OF ZOOLOGY
Ultra-structural elucidation of feeding injury inflicted by the vegetable mite, Tetranychus neoca... more Ultra-structural elucidation of feeding injury inflicted by the vegetable mite, Tetranychus neocaledonicus Andre on the leaves of cassava was done following TEM technique to elucidate anatomical damage and for a detailed investigation into the fine structural changes to Manihot esculenta Crantz leaves following spider mite feeding. The gravity of injury caused to the host leaves was found to increase proportionately with the progressive feeding of the vegetable mites. Leaves with high infestation had marked reduction in thickness following disruption of epidermis and reduction of palisade and spongy mesophyll tissues. Further, there was decline in numerical abundance of cells and organelles like chloroplasts, coagulated protoplasts, structural aberrations at the cellular level, increased space in the mesophyll layers, extensive disruption of the palisade coupled with damage to adjacent cells that were not directly attacked by the mites.
JOURNAL OF ADVANCED APPLIED SCIENTIFIC RESEARCH
Agriculture plays an important role to determine the economy of Kerala. Being primarily an agricu... more Agriculture plays an important role to determine the economy of Kerala. Being primarily an agriculturalstate, contribution of Kerala to the vegetable crop industry is a crucial one. However, despite the rich diversity ofour vegetable crops, knowledge on their faunal composition, particularly of spider mites as pests and other relateddetails remains very much limited. In recent years due to random use of chlorinated hydrocarbons for control ofgeneral pests, which in turn kill their natural enemies, and because of using high yielding varieties and improvedagricultural practices, many mite species which were of less importance or of no value at all during the past haveassumed the status of major pests. These, among other factors have further aggravated the situation of the problemof spider mites as pests.The plant feeding mites (Acari: Tetranychidae) has piercing and sucking type of mouth parts with whichit pierces the leaf tissue and sucks the plant sap. The point of suction is marked...
Uttar Pradesh Journal of Zoology, Jun 24, 2021
Development times of the citrus brown mite, Eutetranychus orientalis (Klein) was evaluated in the... more Development times of the citrus brown mite, Eutetranychus orientalis (Klein) was evaluated in the laboratory on excised leaf disc of Neem, AzadirachtaindicaA. Jussat 35+2 o C & 60+5% relative humidity. Total development times from egg to adult stage were 9.48 +0.09 days. The preoviposition period, oviposition period,post-oviposition period were 0.5 +0, 7.7+0.15 and 0.4+0.07 days respectively. Fecundity averaged 30.1
Post embryonic development of Oligonychus biharensis (Hirst) was traced on cow pea in the laborat... more Post embryonic development of Oligonychus biharensis (Hirst) was traced on cow pea in the laboratory at 30 + 2 o C & 70 + 5% RH. Rearing of the life stages of the mite was carried out following leaf flotation technique. The life cycle of the species was found to comprise both sexual and parthenogenetic generations with slight variations in their respective durations. The respective durations of pre -oviposition period, oviposition period and post -oviposition period were found to be 1.5 days, 11.5 + 0.75 days and 0.9 + 0.25 day. Ovipositional rate of the species was observed to be 50.9 + 4.7 eggs and 40.2 + 1.4 eggs for mated and unmated females respectively. Total duration of sexual development and parthenogenetic development was observed to be 6.45 + 0.05 days and 6.0 + 0.07 days respectively. The sex ratio (male: female) was 1-2: 10.
International journal of scientific research, 2016
Post embryonic development of Oligonychus biharensis (Hirst) was traced on cow pea in the laborat... more Post embryonic development of Oligonychus biharensis (Hirst) was traced on cow pea in the laboratory at 30 + 2oC & 70 + 5% RH. Rearing of the life stages of the mite was carried out following leaf flotation technique. The life cycle of the species was found to comprise both sexual and parthenogenetic generations with slight variations in their respective durations. The respective durations of pre-oviposition period, oviposition period and post-oviposition period were found to be 1.5 days, 11.5 + 0.75 days and 0.9 + 0.25 day. Ovipositional rate of the species was observed to be 50.9 + 4.7 eggs and 40.2 + 1.4 eggs for mated and unmated females respectively. Total duration of sexual development and parthenogenetic development was observed to be 6.45 + 0.05 days and 6.0 + 0.07 days respectively. The sex ratio (male: female) was 1-2: 10.
The coconut mite, Aceria guerreronis Keifer, has emerged as a sporadic pest of the coconut planta... more The coconut mite, Aceria guerreronis Keifer, has emerged as a sporadic pest of the coconut plantations in India inducing serious damage. Coconut provides one third of the agricultural income in Kerala and a major population are dependent on this cash crop directly or indirectly through coconut-based industries like coir, copra, oil, honey, furniture, handicrafts, beverages, bakery products and so on. The economic instability of the coconut farming community and the people employed in coconut-based industries rank the highest order. A critical assessment of the various problems created by the mite A. guerreronis in the agricultural economy of Kerala is presented from a historical point in order to supplement data on crop loss through nut malformation, nut fall, loss in fibre and copra. Future strategies in terms of management practices for an early control of the mite are outlined, and suggestions to alleviate mite damage are presented.
International journal of acarology, Dec 1, 2011
Cytological alterations resulting from feeding of Oligonychus biharensis on Manihot esculenta L. ... more Cytological alterations resulting from feeding of Oligonychus biharensis on Manihot esculenta L. (cassava) plant leaves were examined using transmission electron microscopy in order to reflect upon the mechanical injury and to have a closer observation into the minute details of damage induced to the host leaves by the feeding of these mites. The severity of damage to the host leaves
Systematic & Applied Acarology, Oct 14, 2011
Feeding characteristics and damage induced by the spider mite, Tetranychus ludeni Zacher on the d... more Feeding characteristics and damage induced by the spider mite, Tetranychus ludeni Zacher on the detached leaves of the velvet bean Mucuna deeringiana were evaluated in the laboratory at 30 + 2 o C and 70 + 5% RH. Cultivation of mite-infested (M +) and mite-free (M-) host plants was done by constructing block design plots and replicated. Live cultures of different stages of mites were also maintained in the laboratory using leaf flotation technique. The results showed that T. ludeni could infest almost all age groups of leaves though the middle aged ones showed high population densities. Further, the upper leaf lamina was the preferable feeding site of the mite. Concomitant with feeding, deposition of two types of faecal pellets (black & white) were a notable feature. These pellets exhibited hygroscopic property in accordance with the ambient RH on the leaf surface. The results further reflected on the highly complex colony structure of T. ludeni through silken webbing of the individuals. Analysis of damage symptoms revealed extensive bleaching and chlorosis of the leaves. Chlorophyll loss was significant at 1% levels. Per cent loss in chlorophyll 'a' and 'b' recorded 79.26 + 4.3 % and 74.09 + 4.07 % respectively
Biological Forum, 2011
... mite O. biharensis is a sporadic pest of vegetable crops and many other economically importan... more ... mite O. biharensis is a sporadic pest of vegetable crops and many other economically important plants (Jeppson et al., 1975; Gupta, 1985; Sangeetha ... Formation of such a thick layer over the leaf surface could be explained on the basis of earlier reports by Sumangala and Haq ...
Journal of Experimental Zoology, India, 2008
Journal of Experimental Zoology, India, 2011
Post embryonic development of Oligonychus biharensis (Hirst) was traced on cassava in the laborat... more Post embryonic development of Oligonychus biharensis (Hirst) was traced on cassava in the laboratory at 30 + 2 o C & 70 + 5% RH. Rearing of the life stages of the mite was carried out following leaf flotation technique. The life cycle of the species was found to comprise both sexual and parthenogenetic generations with slight variations in their respective durations. The respective durations of pre-oviposition period, oviposition period and post-oviposition period were found to be 1 day, 10.9 + 0.75 days and 0.8 + 0.22 day. Ovipositional rate of the species was observed to be 44.6 + 4.2 eggs and 30.6 + 1.6 eggs for mated and unmated females respectively. Total duration of sexual development and parthenogenetic development was observed to be 7.75 + 0.09 days and 7.0 + 0.06 days respectively. The sex ratio (male: female) was 1-2: 10.
Development times of the carmine spider mite, Tetranychus cinnabarinus (Boisduval) was evaluated ... more Development times of the carmine spider mite, Tetranychus cinnabarinus (Boisduval) was evaluated in the laboratory on excised leaf disc of lablab bean, Dolichos lablab at 30 + 2 o C and 70 + 5% relative humidity. Total development times from egg to adult stage were 7.33 + 0.13 days. The pre-oviposition period, oviposition period and post-oviposition period were 0.5 + 0, 8.05 + 0.14 and 0.65 + 0.07 days respectively. Fecundity averaged 42.5 + 1.7 eggs and longevity, 9.2 + 0.13 days.
The impact of temperature and relative humidity on the oviposition and fecundity of the spider mi... more The impact of temperature and relative humidity on the oviposition and fecundity of the spider mite, Oligonychus biharensis (Hirst) infesting Manihot esculenta, was studied under 3 constant temperature-humidities combination of 35+2oC & 60+5%RH, 30+2oC & 70+5%RH and 25+2oC & 80+5%RH. Shortest pre-oviposition period (0.5+0.12 days) was noted at 35 + 2oC & 60 + 5% RHfollowed by 30 + 2oC & 70 + 5% RH (1.6+0.1 days) and highest at 25 + 2oC & 80 + 5% RH (1.9+0.07 days). Humidity had little in- fluence on the pre-oviposition and post-oviposition periods when compared to temperature. Fecundity was recorded highest at 35 + 2oC & 60 + 5% RH (75.6+0.9 eggs per female) followed by 30+2oC & 70+5%RH (58.7+0.9 eggs per female). Lowest number of eggs was laid at 25+2oC & 80+5%RH (26.7+0.6 eggs per female). Higher humidity had negative impact on the egg laying capacity as shown by adult females. A decrease in the duration of oviposition period was recorded at low temperatures and higher humidities....
Journal of Experimental Zoology, India, 2011
Post embryonic development of Oligonychus biharensis (Hirst) was traced on cassava in the laborat... more Post embryonic development of Oligonychus biharensis (Hirst) was traced on cassava in the laboratory at 30 + 2C & 70 + 5% RH. Rearing of the life stages of the mite was carried out following leaf flotation technique. The life cycle of the species was found to comprise both sexual and parthenogenetic generations with slight variations in their respective durations. The respective durations of pre-oviposition period, oviposition period and post-oviposition period were found to be 1 day, 10.9 + 0.75 days and 0.8 + 0.22 day. Ovipositional rate of the species was observed to be 44.6 + 4.2 eggs and 30.6 + 1.6 eggs for mated and unmated females respectively. Total duration of sexual development and parthenogenetic development was observed to be 7.75 + 0.09 days and 7.0 + 0.06 days respectively. The sex ratio (male: female) was 1-2: 10.
International journal of scientific research, Mar 1, 2016
JOURNAL OF ADVANCED APPLIED SCIENTIFIC RESEARCH, Dec 15, 2021
Post embryonic development of Oligonychus biharensis (Hirst) was traced on cow pea in the laborat... more Post embryonic development of Oligonychus biharensis (Hirst) was traced on cow pea in the laboratory at 30 + 2 o C & 70 + 5% RH. Rearing of the life stages of the mite was carried out following leaf flotation technique. The life cycle of the species was found to comprise both sexual and parthenogenetic generations with slight variations in their respective durations. The respective durations of pre -oviposition period, oviposition period and post -oviposition period were found to be 1.5 days, 11.5 + 0.75 days and 0.9 + 0.25 day. Ovipositional rate of the species was observed to be 50.9 + 4.7 eggs and 40.2 + 1.4 eggs for mated and unmated females respectively. Total duration of sexual development and parthenogenetic development was observed to be 6.45 + 0.05 days and 6.0 + 0.07 days respectively. The sex ratio (male: female) was 1-2: 10.
UTTAR PRADESH JOURNAL OF ZOOLOGY
Ultra-structural elucidation of feeding injury inflicted by the vegetable mite, Tetranychus neoca... more Ultra-structural elucidation of feeding injury inflicted by the vegetable mite, Tetranychus neocaledonicus Andre on the leaves of cassava was done following TEM technique to elucidate anatomical damage and for a detailed investigation into the fine structural changes to Manihot esculenta Crantz leaves following spider mite feeding. The gravity of injury caused to the host leaves was found to increase proportionately with the progressive feeding of the vegetable mites. Leaves with high infestation had marked reduction in thickness following disruption of epidermis and reduction of palisade and spongy mesophyll tissues. Further, there was decline in numerical abundance of cells and organelles like chloroplasts, coagulated protoplasts, structural aberrations at the cellular level, increased space in the mesophyll layers, extensive disruption of the palisade coupled with damage to adjacent cells that were not directly attacked by the mites.
JOURNAL OF ADVANCED APPLIED SCIENTIFIC RESEARCH
Agriculture plays an important role to determine the economy of Kerala. Being primarily an agricu... more Agriculture plays an important role to determine the economy of Kerala. Being primarily an agriculturalstate, contribution of Kerala to the vegetable crop industry is a crucial one. However, despite the rich diversity ofour vegetable crops, knowledge on their faunal composition, particularly of spider mites as pests and other relateddetails remains very much limited. In recent years due to random use of chlorinated hydrocarbons for control ofgeneral pests, which in turn kill their natural enemies, and because of using high yielding varieties and improvedagricultural practices, many mite species which were of less importance or of no value at all during the past haveassumed the status of major pests. These, among other factors have further aggravated the situation of the problemof spider mites as pests.The plant feeding mites (Acari: Tetranychidae) has piercing and sucking type of mouth parts with whichit pierces the leaf tissue and sucks the plant sap. The point of suction is marked...
Uttar Pradesh Journal of Zoology, Jun 24, 2021
Development times of the citrus brown mite, Eutetranychus orientalis (Klein) was evaluated in the... more Development times of the citrus brown mite, Eutetranychus orientalis (Klein) was evaluated in the laboratory on excised leaf disc of Neem, AzadirachtaindicaA. Jussat 35+2 o C & 60+5% relative humidity. Total development times from egg to adult stage were 9.48 +0.09 days. The preoviposition period, oviposition period,post-oviposition period were 0.5 +0, 7.7+0.15 and 0.4+0.07 days respectively. Fecundity averaged 30.1
Post embryonic development of Oligonychus biharensis (Hirst) was traced on cow pea in the laborat... more Post embryonic development of Oligonychus biharensis (Hirst) was traced on cow pea in the laboratory at 30 + 2 o C & 70 + 5% RH. Rearing of the life stages of the mite was carried out following leaf flotation technique. The life cycle of the species was found to comprise both sexual and parthenogenetic generations with slight variations in their respective durations. The respective durations of pre -oviposition period, oviposition period and post -oviposition period were found to be 1.5 days, 11.5 + 0.75 days and 0.9 + 0.25 day. Ovipositional rate of the species was observed to be 50.9 + 4.7 eggs and 40.2 + 1.4 eggs for mated and unmated females respectively. Total duration of sexual development and parthenogenetic development was observed to be 6.45 + 0.05 days and 6.0 + 0.07 days respectively. The sex ratio (male: female) was 1-2: 10.
International journal of scientific research, 2016
Post embryonic development of Oligonychus biharensis (Hirst) was traced on cow pea in the laborat... more Post embryonic development of Oligonychus biharensis (Hirst) was traced on cow pea in the laboratory at 30 + 2oC & 70 + 5% RH. Rearing of the life stages of the mite was carried out following leaf flotation technique. The life cycle of the species was found to comprise both sexual and parthenogenetic generations with slight variations in their respective durations. The respective durations of pre-oviposition period, oviposition period and post-oviposition period were found to be 1.5 days, 11.5 + 0.75 days and 0.9 + 0.25 day. Ovipositional rate of the species was observed to be 50.9 + 4.7 eggs and 40.2 + 1.4 eggs for mated and unmated females respectively. Total duration of sexual development and parthenogenetic development was observed to be 6.45 + 0.05 days and 6.0 + 0.07 days respectively. The sex ratio (male: female) was 1-2: 10.
The coconut mite, Aceria guerreronis Keifer, has emerged as a sporadic pest of the coconut planta... more The coconut mite, Aceria guerreronis Keifer, has emerged as a sporadic pest of the coconut plantations in India inducing serious damage. Coconut provides one third of the agricultural income in Kerala and a major population are dependent on this cash crop directly or indirectly through coconut-based industries like coir, copra, oil, honey, furniture, handicrafts, beverages, bakery products and so on. The economic instability of the coconut farming community and the people employed in coconut-based industries rank the highest order. A critical assessment of the various problems created by the mite A. guerreronis in the agricultural economy of Kerala is presented from a historical point in order to supplement data on crop loss through nut malformation, nut fall, loss in fibre and copra. Future strategies in terms of management practices for an early control of the mite are outlined, and suggestions to alleviate mite damage are presented.
International journal of acarology, Dec 1, 2011
Cytological alterations resulting from feeding of Oligonychus biharensis on Manihot esculenta L. ... more Cytological alterations resulting from feeding of Oligonychus biharensis on Manihot esculenta L. (cassava) plant leaves were examined using transmission electron microscopy in order to reflect upon the mechanical injury and to have a closer observation into the minute details of damage induced to the host leaves by the feeding of these mites. The severity of damage to the host leaves
Systematic & Applied Acarology, Oct 14, 2011
Feeding characteristics and damage induced by the spider mite, Tetranychus ludeni Zacher on the d... more Feeding characteristics and damage induced by the spider mite, Tetranychus ludeni Zacher on the detached leaves of the velvet bean Mucuna deeringiana were evaluated in the laboratory at 30 + 2 o C and 70 + 5% RH. Cultivation of mite-infested (M +) and mite-free (M-) host plants was done by constructing block design plots and replicated. Live cultures of different stages of mites were also maintained in the laboratory using leaf flotation technique. The results showed that T. ludeni could infest almost all age groups of leaves though the middle aged ones showed high population densities. Further, the upper leaf lamina was the preferable feeding site of the mite. Concomitant with feeding, deposition of two types of faecal pellets (black & white) were a notable feature. These pellets exhibited hygroscopic property in accordance with the ambient RH on the leaf surface. The results further reflected on the highly complex colony structure of T. ludeni through silken webbing of the individuals. Analysis of damage symptoms revealed extensive bleaching and chlorosis of the leaves. Chlorophyll loss was significant at 1% levels. Per cent loss in chlorophyll 'a' and 'b' recorded 79.26 + 4.3 % and 74.09 + 4.07 % respectively
Biological Forum, 2011
... mite O. biharensis is a sporadic pest of vegetable crops and many other economically importan... more ... mite O. biharensis is a sporadic pest of vegetable crops and many other economically important plants (Jeppson et al., 1975; Gupta, 1985; Sangeetha ... Formation of such a thick layer over the leaf surface could be explained on the basis of earlier reports by Sumangala and Haq ...
Journal of Experimental Zoology, India, 2008
Journal of Experimental Zoology, India, 2011
Post embryonic development of Oligonychus biharensis (Hirst) was traced on cassava in the laborat... more Post embryonic development of Oligonychus biharensis (Hirst) was traced on cassava in the laboratory at 30 + 2 o C & 70 + 5% RH. Rearing of the life stages of the mite was carried out following leaf flotation technique. The life cycle of the species was found to comprise both sexual and parthenogenetic generations with slight variations in their respective durations. The respective durations of pre-oviposition period, oviposition period and post-oviposition period were found to be 1 day, 10.9 + 0.75 days and 0.8 + 0.22 day. Ovipositional rate of the species was observed to be 44.6 + 4.2 eggs and 30.6 + 1.6 eggs for mated and unmated females respectively. Total duration of sexual development and parthenogenetic development was observed to be 7.75 + 0.09 days and 7.0 + 0.06 days respectively. The sex ratio (male: female) was 1-2: 10.
Development times of the carmine spider mite, Tetranychus cinnabarinus (Boisduval) was evaluated ... more Development times of the carmine spider mite, Tetranychus cinnabarinus (Boisduval) was evaluated in the laboratory on excised leaf disc of lablab bean, Dolichos lablab at 30 + 2 o C and 70 + 5% relative humidity. Total development times from egg to adult stage were 7.33 + 0.13 days. The pre-oviposition period, oviposition period and post-oviposition period were 0.5 + 0, 8.05 + 0.14 and 0.65 + 0.07 days respectively. Fecundity averaged 42.5 + 1.7 eggs and longevity, 9.2 + 0.13 days.
The impact of temperature and relative humidity on the oviposition and fecundity of the spider mi... more The impact of temperature and relative humidity on the oviposition and fecundity of the spider mite, Oligonychus biharensis (Hirst) infesting Manihot esculenta, was studied under 3 constant temperature-humidities combination of 35+2oC & 60+5%RH, 30+2oC & 70+5%RH and 25+2oC & 80+5%RH. Shortest pre-oviposition period (0.5+0.12 days) was noted at 35 + 2oC & 60 + 5% RHfollowed by 30 + 2oC & 70 + 5% RH (1.6+0.1 days) and highest at 25 + 2oC & 80 + 5% RH (1.9+0.07 days). Humidity had little in- fluence on the pre-oviposition and post-oviposition periods when compared to temperature. Fecundity was recorded highest at 35 + 2oC & 60 + 5% RH (75.6+0.9 eggs per female) followed by 30+2oC & 70+5%RH (58.7+0.9 eggs per female). Lowest number of eggs was laid at 25+2oC & 80+5%RH (26.7+0.6 eggs per female). Higher humidity had negative impact on the egg laying capacity as shown by adult females. A decrease in the duration of oviposition period was recorded at low temperatures and higher humidities....
Journal of Experimental Zoology, India, 2011
Post embryonic development of Oligonychus biharensis (Hirst) was traced on cassava in the laborat... more Post embryonic development of Oligonychus biharensis (Hirst) was traced on cassava in the laboratory at 30 + 2C & 70 + 5% RH. Rearing of the life stages of the mite was carried out following leaf flotation technique. The life cycle of the species was found to comprise both sexual and parthenogenetic generations with slight variations in their respective durations. The respective durations of pre-oviposition period, oviposition period and post-oviposition period were found to be 1 day, 10.9 + 0.75 days and 0.8 + 0.22 day. Ovipositional rate of the species was observed to be 44.6 + 4.2 eggs and 30.6 + 1.6 eggs for mated and unmated females respectively. Total duration of sexual development and parthenogenetic development was observed to be 7.75 + 0.09 days and 7.0 + 0.06 days respectively. The sex ratio (male: female) was 1-2: 10.