Impact of weather factors on seasonal abundance and population dynamics of Yellow Mite, Polyphagotarsonemuslatus (Banks) on different varieties of Jute, Corchorusolitorius L. under net house conditionAbstract :
The outbreak of yellow mite, Polyphagotarsonemus latus population almost regularly as one of the most serious pests of jute crop (Corchorus olitorius L.) in Bangladesh. The experiment was conducted to ascertain the effect of weather factors on incidence and population development of yellow mite, (Polyphagotarsonemus latus; Acari: Tarsonemidae).The objective of this study was to determine effects of rainfall and mean temperature on the abundance and the seasonal dynamics of yellow mite stages of four jute varieties (O-9897, O-72, OM-1 and O-795). Population fluctuation at all stages of yellow mite at 7 days interval after infestation observed highest fluctuation peak for egg (117.67�24.64) at June 10, larva (87.33�4.67) at June 17, pupa (87.33�4.67) at May 6, female (35.00�5.13) at June 17 and male (11.67�1.67) at May 6 in the variety of OM-1 among others varieties under net house condition. Yellow mite stages varied significantly among varieties of jute plants at all sampling dates. All stages of the mite preferred the undersides of the leaves than its upper-sides. Among the different environmental factors mean temperature and weekly total rainfall was positively correlated with the different stages of P. latus population. The determination of the effects of different weather factors on population and incidence of P.latus in jute is essential for effective pest management. This study not only helpful in forecasting outbreaks of P.latus but also effective pest management strategies in formulation.
Polyphagotarsonemus latus, weather factors, correlation, seasonal abundance, varieties.