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20171
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Subject: Entomology × Author: Borah, Binita × End date: 2019 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Development of bio-intensive IPM module against insect pests of rice
    (AAU, Jorhat, 2017-07) Borah, Binita; Das, Purnima
    Field experiment were carried out carried out in ICR (Instructional cum Research) Farm during Sali and Ahu season 2016-2017. Incidence of major pest stem borer, leaf folder, caseworm, whorl maggot and gundhi bug and their natural enemies viz., coccinellid, spiders, and dragonfly/damselfly were recorded throughout the crop growth period. However, the stem borer, leaf folder, caseworm, whorl maggot and gundhi bug were more prominent during Sali season, 2016 and stem borer, leaf folder, caseworm, whorl maggot and gundhi bug were prominent during Ahu season, 2017. Among all the pests, the stem borer was most dominant (6.16% DH) and leaf folder was least dominant (3.93%) at early stage of crop during Sali season, 2016 whereas, during Ahu season, 2017 the whorl maggot was most dominant (9.76%).The correlation study revealed that the infestation of different pests and their natural enemies was influenced by the weather parameters in both the years. Correlation studies during Sali, 2016 revealed that infestation of stem borer had significant negative relation with Tmax (r= -742) and significant positive relation with RH (mor) (r =0.795). The infestation of leaf folder had significant negative relation with Tmin (r =-0.804), RD (r =-0.499), RH (mor) (r =-0.760); and the infestation of caseworm had significant negative relation with Tmin (r =-0.848), RD (r=-0.535); whereas it showed significant positive correlation with RH (mor) (r =+0.709). Gundhi bug had significant negative relation with Tmax (r =-0.775), with Tmin (r=-0.930). Correlation studies during the Ahu season, 2017 showed that the infestation of whorl maggots had significant positive relation with Tmax (r =+0.741) and Tmin (r =+0.972) and the infestation of stem borer had significant positive relation with Tmax (r =0.726) and Tmin(r =0.942) and no significant relation was found between gundhi bug and meteorological parameters during Ahu, 2017. Out of the eight treatment tested, the treatment combinaton of Beauveria bassiana WP @ 10gm/lit along with sub-lethal dose of chlorpyriphos 20EC @ 1ml/lit was found to be most effective in reducing the infestation of stem borer, leaf folder,case worm and whorl maggot during during Sali and Ahu 2016-2017.