Incidence pattern of guava shoot borer, Microcolona technographa Meyrick (Lepidoptera: Agonoxidae) in relation to weather conditions in West Bengal, India
Incidence pattern of shoot borer (Microcolona technographa Meyrick) on guava and the effect of weather
parameters on its occurrence were studied during 2014 and 2015 at Horticulture Research Station (HRS), Mondouri,West
Bengal, India.The infestation of the shoot borer, Microcolona technographa Meyrick (Lepidoptera: Agonoxidae) started by
end of January to mid February coinciding with the increase of temperature and emergence of new flush and with its peak
activitywas recorded frommiddle of Julyto 2nd week ofAugust. Correlation studies revealed that bothmaximumandminimum
temperature, RHminimum, vapour pressure and rainfall showed significant positive effect, while sunshine hours had negative
impact. The density of the larval population in the shoots of guava significantly varied in different direction and followed
the trend like East > South > North > West.
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