Population dynamics of two spotted spider mite tetranychus urticae koch on parthenocarpic cucumber in net house (original) (raw)
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The population abundance of the two-spotted spider mite, Tetranychus urticae that infest cucumber plants in upper-Egypt was investigated during spring plantations of 2015 and 2016 season. Data showed that the population of the spider mite population varied in its density during the entire season of both seasons with a peak number occurrence the end of season (May 30), when plant age was 90 day-old when temperature and relative humidity were in moderate levels. Also, this study revealed that the cucumber plants highly impacted by the pest in addition to the few number of predators were observed during these seasons. The abiotic factors, e.g. temperature, relative humidity, and the plant age, more likely to induce the infestation than the biotic factors (predators). Accordingly, further studies are needed to examine the factors affecting the population of this pest. This study may be useful for determining the timing of the control program for T. urticae that infest cucumber plants during spring plantations.
International Journal of Tropical Insect Science, 2020
Seasonal abundance of the two spotted spider mite, Tetranychus urticae (Koch) (Acari) infesting cucumber plants in Upper Egypt was studied during three seasons of 2014, 2015 and 2016 in Assiut Governorate. The obtained results showed that the spider mite, T. urtica population during spring plantations fluctuated in relatively high densities during whole season with a peak during the middle of May when the plant age was 43 day-old and the presence of an average level of temperature and relative humidity. In addition, the data indicated that the number of predators was not significantly correlated with pest populations during the spring plantations of 2015 and 2016 seasons, probably because of the lowest numbers of predators recorded in the studied area. The present study showed that the cucumber plants severely affected by the two spotted spider mite, T. urticae . In addition to the scarce numbers of predators recorded during spring and/or summer plantations.
International Journal of Acarology, 2010
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African Entomology, 2016
The developmental and reproductive biology of the two-spotted spider mite, Tetranychus urticae (Koch), a devastating polyphagous pest, were studied on five vegetables in summer (27-36°C, RH 81-85 %) and winter (5-19°C, RH 70-75 %) under prevailing laboratory conditions. Immature developmental time and adult longevity were inversely related to seasons. The results indicated that the development of the mite increased more rapidly on bean in summer than on the other tested hosts. The longest developmental period was 41.94 and 41.07 days for females and males, respectively, in winter when T. urticae was fed on cowpea. In contrast, it was the shortest (11.25 and 10.39 days) in summer while reared on bean. Lifetime fecundity (62.71) and daily fecundity (5.48) was the highest on bean in summer. The sex ratio (female:male) was the highest (0.76) on cowpea and the lowest (0.66) on brinjal in winter. Survivorship during immature development varied from 82.14 to 95.65 %, with the lowest rate in summer when reared on bean. Life table parameters were analysed and the generation time (T) was found the lowest (20.37) in summer when fed on bean, net reproductive rate (R0) was the highest (36.29) in summer on cowpea and both intrinsic rate of natural increase, rm (0.17), and finite rate of increase, l (1.19), were the highest in summer when fed on bean.
Systematic and Applied Acarology, 2019
Cultivating resistant host plants has been considered as an important strategy for sustainable pest management of mites. The current study was conducted to evaluate the response of 43 cucumber (Cucumis sativus L.) cultivars against two important tetranychid species, two-spotted spider mite (Tetranychus urticae Koch.) and strawberry spider mite (Tetranychus turkestani Ugarov & Nikolski). The experiment was implemented in a Randomized Complete Block design (RCB) with 43 treatments replicated 4 times in a greenhouse during 2015-2016. Two main evaluation criteria, cultivar injury rate (from 1 to 5) and number of eggs/female/day (EFD) on each cultivar, were used to compare responses. The results revealed that the highest number of eggs/female/day (EFD) for both mites was observed on Taha cultivar (9.0±0.40 and 9.5±0.28 for T. urticae and T. turkestani, respectively). The highest injury rate was also observed on this cultivar (4.8±0.26 and 5.0±0.0 for T. urticae and T. turkestani, respect...
Screening of some cucumber accessions to two-spotted spider mite (Tetranychus urtica e)
2012
The two-spotted spider mite, Tetranychus urticae (Koch) is one of the most important pests of cucurbits, that can infests more than 200 species. In order to finding resistance sources in cucumber, ten accessions from Gene Bank were selected for further studying. Ten seeds of each accession were cultivated in seed trays (one seed per pot). At six leaf stage, one leaf (about 4 cm 2 ) from each plant was detached and placed around a circle with a diameter of 100 cm. In order to determine the antixenosis, ten adult females were released at the center of circle for each leaf. Experimental plots were arranged as a randomized complete block design with three replications. The number of mites feeding on each leaf was recorded after 24 and 48 hours. Statistical analysis showed significant differences between accession and indicated antixenosis resistance (p<0.05). Maximum number of mites were observed at C104 (12.79±0.53) and C118 (12.3±0.4) and the minimums were observed in C90 (5.58±0.6...
STUDY ON THE DEVELOPMENTAL STAGES OF SPIDER MITE (TETRANYCHUS URTICAE KOCH) INFESTING COUNTRY BEAN
2008
The duration of developmental stages of Tetranychus urticae Koch was studied in different months of a year at room temperature. In addition fecundity of this mite was also observed in winter, autumn and summer seasons. T. urticae eggs hatched to larvae in the shortest duration of 1.07 ± 0.26 days and the longest duration of 11.67 ± 2.33 days in April and January, respectively. The larval period of T. urticae took the shortest time of 0.55 ± 0.50 days in May and 2.93 ± 1.07 days in December. The protonymph transformed to deutonymph in 0.89 ± 0.32 day in May and 3.71 ± 1.94 in December and January. The deutonymph required the shortest duration of 0.92 ± 0.41 days in August and the longest of 10.26 ± 1.48 days in January. The temperature played significant (P<0.001) role on the duration of developmental stages of T. urticae. The high temperature accelerated the developmental rate and reduced the duration of developmental periods. Its life cycle completed within 4.22 ± 0.46 days at 28.53 ± 3.17°C but 28.33 ± 2.36 days at 13.78 ± 2.36°C. A female T. urticae deposited 82.46 ± 4.11 eggs in autumn, 62.96 ± 12.09 eggs in summer and 58.21 ±1 3.65 eggs in winter.
Study on the developmental Stages of Spider Mite (Tetranychus urticae Koch) Infesting Country Bean
Journal of Bio-Science, 1970
The duration of developmental stages of Tetranychus urticae Koch was studied in different months of a year at room temperature. In addition fecundity of this mite was also observed in winter, autumn and summer seasons. T. urticae eggs hatched to larvae in the shortest duration of 1.07 ± 0.26 days and the longest duration of 11.67 ± 2.33 days in April and January, respectively. The larval period of T. urticae took the shortest time of 0.55 ± 0.50 days in May and 2.93 ± 1.07 days in December. The protonymph transformed to deutonymph in 0.89 ± 0.32 day in May and 3.71 ± 1.94 in December and January. The deutonymph required the shortest duration of 0.92 ± 0.41 days in August and the longest of 10.26 ± 1.48 days in January. The temperature played significant (P<0.001) role on the duration of developmental stages of T. urticae. The high temperature accelerated the developmental rate and reduced the duration of developmental periods. Its life cycle completed within 4.22 ± 0.46 days at 2...
University Journal of Zoology, Rajshahi University, 2012
The seasonal abundance of spider mite T. urticae on twenty vegetable and twenty four ornamental plants in Rajshahi was conducted during August 2010 to January 2011. The mite was present on joscpks coat, kathua, ladys finger, cucumber, brinjal, tomato, bottle gourd, bean, loofah, spinach, bitter melon, pointed gourd, radish, and cowpea but no mite was recorded on other six plants. But all the ornamental plants bagan-bilash, bottlebrush, nayantara, morog-jhuti, hasnahena, chandramallika, dalia, krisno-chura, togor, joba, madhobilata, rongon, beli, daisy, sondhamaloti, kamini, musanda, rakto-karobi, shewli, kath-golap, rajanigandha, golap, ganda, zinia contained mites. The pick population was prevailed during August. The increase of mite number is directly related with the increase of temperature. DOI: http://dx.doi.org/10.3329/ujzru.v30i0.10745Univ. j. zool. Rajshahi Univ. Vol. 30, 2011 pp. 37-40
Journal of Applied and Natural Science
Field trials were conducted to assess the damage potential of two-spotted spider mite (Tetranychus urticae Koch) on cucumber (Cucumis sativus Linnaeus). Young cucumber plants were artificially infested with different densities of T. urticae (5, 10, 15 and 20 mites/ grown up leaf) while uninfested plants acted as control. Post infestation, the plants differed in their support to mite density in accordance with initial infestation density and observation period. Grown up leaves were found to be the most susceptible to mite infestation (5.86 mites/ sq. cm leaf). The number of feeding (chlorotic) patches on cucumber leaves significantly increased from 1.38/sq cm at a pre-count of 5 mites per grown up leaf to 1.71/sq cm leaf at a pre-count of 20 mites as compared to no patch recorded in control. Highly significant negative correlation was recorded between mite population and photosynthetic pigments. Total chlorophyll, chlorophyll-a, chlorophyll-b and carotenoids decreased to a maximum of...