Life cycle of Oligonychus coffeae (Acari: Tetranychidae) on tea leaves in Darjeeling, West Bengal, India
TL;DR: The life cycle of the tea red spider mite, Oligonychus coffeae, Nienter was studied on tea leaves in Darjeeling under laboratory conditions at 20°C and 65% relative humidity and will hopefully help to devise a management strategy for this pest species.
Abstract: The tea plant, Camellia sinensis (L.), has been cultivated since ancient time and is host to several pest species that can significant reduce productivity. One such pest species is the tea red spider mite. The life cycle of this species, Oligonychus coffeae, Nienter was studied on tea leaves in Darjeeling under laboratory conditions at 20°C and 65% relative humidity. Observations were recorded on freshly laid eggs on tea leaves and continued until individuals reached adulthood. The eggs required an average of 16.17 days to develop into adults. The average longevity of adult was 28.67 days. Our findings contribute to the understanding of mite abundance and population fluctuations in different seasons and climates, and will hopefully help to devise a management strategy for this pest species.
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TL;DR: The increase in phenolic and alcoholic components and decrease in Chl contents may affect the quality of Darjeeling tea and the extent of damages done by the pests measured here could aid the pest management in tea gardens.
Abstract: Introduction Darjeeling tea of India is one of the most famous beverages globally. However, a large amount of tea crop is damaged every year by the attack of mites. Objectives The study aimed to determine the changes in different pigments and biochemical components of tea leaves due to mite infestation. Materials and methods We used UV-visible and Fourier-transform infrared (FTIR) spectroscopy simultaneously to understand the damages in pigment contents of the leaves of tea (Camellia sinensis (L.) Kuntze) due to attack of phytophagus mite, Oligonychus coffeae Nietner. Furthermore, chemical analysis of infested tea leaves was also performed to compare the nutrients of the plants, namely total phenol, protein and soluble sugar. Results The UV-visible study reveals severe reduction of the pigments such as chlorophyll (Chl), carotenoids and xanthophylls in the tea leaf due to mite infestation. The findings of the FTIR study, also shows variation in different physiochemical components in the leaf Chl. The sugar and protein content of the infested leaves have been reduced compared to uninfested ones. Results in the case of tea leaves plucked during first (March) and third (November) flushes show similar trends. Conclusion The increase in phenolic and alcoholic components and decrease in Chl contents may affect the quality of Darjeeling tea. The extent of damages done by the pests measured here could aid the pest management in tea gardens.
6 citations
TL;DR: It appears that C. buchanani is better host among the two hosts as because the life cycle was completed in shorter time, recording high fecundity and longer longevity.
Abstract: The present paper reports duration of different developmental stages as well as fecundity, longevity, oviposition periods, sex ratio, etc. of Tetranychus sayedi Baker & Pitchard on two medicinal plants, viz. Cryptolepis buchanani Roem & Schult and Justicia adhatoda L. under laboratory condition at 27.5 °C and 65% R.H. during February-March, 2016. The two hosts in which the life cycle was studied form two new records of hosts for this mite. It appears that C. buchanani is better host among the two hosts as because the life cycle (egg to adult) was completed in shorter time, recording high fecundity and longer longevity.
2 citations
Cites background or methods or result from "Life cycle of Oligonychus coffeae (..."
...…(Puttaswamy and Channabasavanna 1980; Mallikarajunappa and Nageshchandra 1989; Manjunatha and Puttuswamy 1989; Sirsikar and Nagabhushanam 1989; Nayak et al. 2007; Rai et al.1989; Tello et al. 2009; Haque et al. 2007; Kaimal and Ramani 2011; Biswas et al. 2013; Podder et al. 2014, respectively)....
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...…in the present study was much shorter as compared to duration reported by Maity and Chakrabarti (1978), Mallikarajunappa and Nageshchandra (1989), Podder et al. (2014) and much higher as compared to duration reported by Sirsikar and Nagabhushanam (1989), Kaimal and Ramani (2011), but close to…...
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...…days in T. chinnabarinus (Tello et al. 2009); 0.79 ± 0.07 days in T. chinnabarinus (Kaimal and Ramani 2011); 1.00 ± 0.17 days in T. macfarlanei on C. ternatea and 3.6 ± 0.34 days in the same mite on J. adhatoda (Biswas et al. 2013); 6.4 ± 0.21 days in O. coffeae on tea leaves (Podder et al. 2014)....
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...The daily fecundity of the fertilized female of O. coffeae, was 6.12 ± 1.14 as recorded by Podder et al. (2014)....
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...…fertilized female on lablab beans (Kaimal and Ramani 2011); 1.0 ± 0.00 days in case of fertilized female and C. ternatea and 1.0 ± 0.00 days in case of fertilized female J. adhatoda in T. macfarlanei by (Biswas et al. 2013); 3.00 ± 0.60 days in fertilized female of O. coffeae (Podder et al. 2014)....
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TL;DR: The experiment was conducted to study the duration of different developmental stages of Oligonychus coffeae Nietner in six generations in different seasons of the year, and the highest temperature accelerated the developmental rate and reduced theduration of developmental stages.
Abstract: The experiment was conducted to study the duration of different developmental stages of Oligonychus coffeae Nietner in six generations in different seasons of the year. The eggs of O. coffeae developed to adult within the shortest duration of 5.30±0.16 days at 30.28°C and 76.00% RH in June, but it took 12.91±0.21 days at 19.80°C and 75.41% RH in January. The highest temperature accelerated the developmental rate and reduced the duration of developmental stages. Temperature exerted significant effect on all the developmental stages of O. coffeae except deutonymph. But the relative humidity had no significant effect except deutonymph. Key words: Developmental stages, red spider mite, Oligonychus coffeae rose
Univ. j. zool. Rajshahi Univ. Vol. 26, 2007. pp. 71-72
14 citations
Journal Article•
TL;DR: All the three zones of shaded tea have less mites than the corresponding zones of unshaded tea.
Abstract: А marked variation exists in the distribution of the red spider mite Oligonychus coffeae (Nietner) in the upper, middle and lower zones of both shaded and unshaded teas. In the shaded tea, upper zone hasthe highest mite population, апа this is followed Ьу middle and lower zones. In unshaded tea miadle zone has the highest mite population and the upper zone the least. All the three zones of shaded tea have less mites than the corresponding zones of unshaded tea. Leaf temperature and light penetration within the bushes appear to regulate the distribution of mites.
11 citations
Journal Article•
TL;DR: The intrinsic rate of increase and other population parameters of the mite were higher on China variety than on Assam variety of tea.
Abstract: The growth potentialities of the red spider mite Oligonychus coffeae (Nietner) at 30° +/- 3°C; 85 +/- 5 % R. H. on Assam and China varieties of tea were measured. The intrinsic rate of increase and other population parameters of the mite were higher on China variety than on Assam variety of tea.
4 citations