Studies on the Seasonal Occurrence of Insect Pests of Jasmine, Jasminum sambac Linn (original) (raw)
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Influence of abiotic factors on major insect and mite pests of jasmine, Jasminum sambac L
Journal of entomology and zoology studies, 2020
Jasmine is an important ornamental crop with attractive fragrant flowers, fetches instant revenue to the farmers. It is attacked by several insect pests and cause considerable economic loss. Studies on seasonal occurrence of insect pests of jasmine was studied during 2019-20 at Tiruchirappalli, India. Among different insect pests, blossom midge was recorded with maximum incidence during August II (34.05% Infested buds). Occurrence of midge was positively correlated with maximum temperature (r = 0.159) and minimum temperature (r = 0.505). The multiple linear regression on damage with weather parameter was worked out and it indicates that the cecidomyid pest was 85.4% influenced by various weather parameters. The incidence of other insect pests viz., bud worm, leaf web worm and red spider mite was recorded and correlated with weather parameters.
Seasonal incidence of major insect pests of jasmine Jasminum sambac L
Indian Journal of Entomology
Jasmine Jasminum sambac L. is an important ornamental crop that fetches recurrent income to farmers. The present study was carried out in three locations Sevandhanagar, Navalurkuttappattu and Horticulture farm, TNAU, Tiruchirappalli, Tamil Nadu, India from August 2019 to September 2020. The seasonal incidence of major insect pests such as Hendecasis duplifascialis Hampson, Nausinoe geometralis Guenee, Contarinia maculipennis Felt, Frankliniella scultzei Trybom and Tetranychus urticae Koch were studied. Hendecasis duplifascialis incidence was observed to be maximum (31.63% damaged buds) in second fortnight of October in Sevandhanagar; in Navalurkuttappattu, it was the incidence of N. geometralis (2.2 webs/ plant) that was maximum, and noticed in the second fortnight of December. In horticulture farm, maximum damage was of C. maculipennis (48.66% damaged buds) noticed in the second fortnight of September. Thrips population was significant and was observed positively correlated with ma...
Surveys were conducted during 2015-2016, in major jasmine growing districts of Tamil Nadu, for assessing the distribution, infestation level and the relative importance of jasmine budworm, Hendecasis duplifasialis Hampson. The budworm incidence was more in Madurai (45.18 %) followed by Tiruneveli (41.35%), Dindugal (33.54 %) and Coimbatore districts (29.78 %). Fifty three per cent respondents ranked budworm as the most important pest. The technological gap indices (TGI) were high in adopting right frequency in spraying of chemicals (91 %), usage of biological control agents (87 %) and effective cultural practices viz., regular raking of soil to destroy pupa (85 %) and collection and destruction of fallen and discolored buds and flowers (82 %). A majority of respondents (52.94 %) had high level of technological gap, whereas, only 11.76 % were in low level of technology gap. Thus, efforts should be taken to create awareness among jasmine growers for the use of eco-friendly bio-control methods against jasmine budworm as well as other pests of jasmine.
Biodiversitas, 2022
The decline in productivity of gambier jasmine flowers is not only caused by the reduction of gambier jasmine land area but also insect, caterpillar and pest mite attacks. Types of pest mites and their population dynamics are closely related to abiotic factor conditions such as temperature, humidity, rainfall, season, an abundance of predatory mites and types of plant cultivars. The study aimed to determine the types of pest mites and some abiotic factors that affect their abundance in gambier jasmine plants. The research method was a survey with a purposive sampling technique. Sampling locations were in Cipawon village, Bukateja sub-district, Purbalingga district, and Central Java Province, Indonesia. The obtained data were analyzed by analysis of variance at an error rate of 0.05. The types of pest mites that were identified consisted of 8 species, namely Brevipalpus phoenicis, B. californicus, B. papayensis, B. obovatus, Tetranychus urticae, T. kanzawai, T. cinnabarinus and Tyrophagus putrescentiae. The type of pest mite always found at each sampling point was B. phoenicis, with an abundance range of 0.027 to 0.067. The results of the analysis of the variance of pest mite abundance in gambier jasmine plantations showed that abundance of individuals between pest mite species did not significantly differ at all sampling points. Based on multivariate analysis, it was noted that trichome density had the most influence on pest mite abundance with a population model of Y = 0.399 + 0.043a + 0.012b.
Field experiment was conducted to study the seasonal incidence of insect pests and natural enemies revealed that aphid (L. erysimi), flea beetle (P. cruciferae) and sawfly (A. lugens proxima) were appeared during 51 st SMW i.e. 3 rd week of December, 2018 while the natural enemies viz., ladybird beetle (C. transversalis) and D. rapae appeared during 4 th SMW i.e. (last week of January, 2019). The correlation studies between different weather parameters and population of major insect pests revealed that maximum temperature recorded positive correlation with aphid, flea beetle and sawfly with correlation coefficient, r= 0.502, r= 0.510 and r= 0.461, respectively. In case of natural enemies observed in mustard field, maximum temperature had a positive impact on C. transversalis (r= 0.195) and D. rapae population (r= 0.194). Minimum temperature had non-significant positive correlation with aphid (r= 0.456) and flea beetle (r= 0.120) population but had a significant negative correlation with sawfly population (r=-0.625) and significant positive correlation with ladybird beetle (r= 0.669) and D. rapae population (r= 0.682). Morning relative humidity had non-significant negative correlation with all the insect pests observed in mustard crop except aphid where it was found to be significant (r=-0.606). Evening relative humidity had non-significant negative correlation with aphid (r=-0.251), flea beetle (r=-0.484) and sawfly (r=-0.525) population and in case of natural enemies viz., C. transversalis (r=-0.058) and D. rapae (r=-0.047) also it was found to be negatively correlated. Rainfall had positive and nonsignificant correlation with aphid (r= 0.038), C. transversalis (r= 0.066) and D. rapae (r= 0.080) population but it had negative and non-significant correlation with flea beetle (r=-0.206) and sawfly population (r=-0.552).
SEASONAL VARIATION OF MAJOR INSECT PESTS INCIDENCE IN BRINJAL CROP
Journal of Experimental Zoology India, 2020
The present investigation was carried out during the Kharif season, 2017-18 at Student's Instructional Farm, N. D. University of Agriculture and Technology, Kumarganj, Faizabad (U.P.), India. The incidence of three major insect viz., Jassid (Amsacta biguttula biguttula), White fly (Bemacia tabaci) and Epilachna beetle (Henosepilachna vigintioctopunctata) were recorded. The incidence of whitefly and jassid were noticed for the first time from 36 th SW onwards while Epilachna beetle were seen from 41 st SW. The incidence of brinjal shoot and fruit borer was noticed for the first time from 39 th SW onwards. Maximum and minimum whitefly population was observed in 42 nd SW and 36 th SW i.e. 4.40 and 0.53 whiteflies/cage, respectively. Maximum and minimum jassid population was observed in 42 nd SW and 36 th SW i.e. 2.33 and 0.13 jassids/cage, respectively. Maximum and minimum epilachna beetle population was observed in 46 th SW and 5 th SW i.e. 2.33 and 0.07 beetles/3 leaves, respectively. Correlation coefficient was worked out between the incidence of insect pests and abiotic factors. In case of whitefly and jassid, the correlation was positive with minimum and maximum temperature while it was negative with RH and rainfall. In case of epilachna beetle, the correlation was negative with minimum and maximum temperature as well as with RH and rainfall.
2021
Population dynamics of insect pests on black gram was studied in relation with weather parameters during pre-kharif 2018 and 2019 in terai region of West Bengal, India. The result revealed that the peak population of whiteflies (7.20/trifoliate/plant) was observed on 14 SMW in 2018, while it was 6.30/trifoliate/plant on 15 SMW in 2019. The peak population of jassids was noticed in 16 SMW in both the year and the population ranged from 4.37 to 4.57/trifoliate/plant. The aphid population started appearing on 8 SMW and increased gradually to reach highest level (24.57/10cm twig/plant and 41.90/10cm twig/plant in 2018 and 2019 respectively) on 10 SMW. The highest larval population of spotted pod borer (1.53/plant and 1.45/plant) and damage (16.07% and 16.29%) to the pod were found during 19 SMW in both the year. Correlation studies indicated that white fly, aphids and spotted pod borer larval population exhibited a significant negative correlation with temperature, relative humidity and...