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ThesisItem Open Access Studies on insect pests of guava and evaluation of management strategies against guava fruit fly(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2020-12) Arya, Astha; Pandey, A.K.During the study, fruit fly (Bactrocera spp.), Mealy bug (Ferrisia virgita), Guava shoot borer (Microcolona technographa), Pomegranate butterfly (Virachola (Duodorix) Isocrates) and Castor capsule borer (Conogethes punctiferalis) were recorded as major pests infesting guava. Highest fruit fly population i.e. 374 fruit fly /trap was recorded in the month of July i.e. 28th standard week of the year 2019 with maximum and minimum temperature and relative humidity of 39.7 and 25.2 ˚C and 69 and 35% respectively. In laboratory condition, there was short duration of pre-pupal period, duration of larval period and pupal period in case of pumpkin. Highest population i.e. 39 mealy bug per branch was recorded in May i.e. 19th standard week of the year 2019 with maximum and minimum temperature and relative humidity of 40.7 and 19.6°C and 51 and 16 % respectively. Maximum infestation of castor capsule borer in guava i.e. 8.39 was recorded in the 27th standard week of the year 2019 with weekly average maximum and minimum temperature and, maximum and minimum relative humidity was 38.2 and 25.7 ˚C and 65 and 39 % respectively Highest infestation of anar butterfly i.e. 7.58% was recorded in 34th standard week of the year 2019 with average weekly maximum and minimum temperature, minimum and maximum relative humidity of 32.3 and 24.7˚C, 90 and 66%, respectively. Highest infestation of shoot borer i.e. 47% was recorded in first fortnight of June i.e. 24th standard week with maximum and minimum temperature and relative humidity of 39 and 25.1˚C and 69 and36 respectively and it concluded that shoot pruning plays an important role in managing the infestation of shoot borer in guava thus can increase the yield. Various Integrated pest management modules were formulated and evaluated against fruit fly during 2019-2020 at Horticulture Research Station, GBPUA&T Pantnagar, Uttarakhand. The experiment was laid down in Randomized block design with three replications. There was total 7 IPM modules as treatment including a control. Occurrence of fruit fly was initiated in the month of March. The population increased with increase in temperature and achieving its peak during July. Thereafter decreasing population of fruitfly was recorded. Among the various combination of IPM modules, modules consisting of spraying of insecticide (Spinosad 4ml/tree) + pheromone trap+ hoeing at 15 days interval + sanitation at 10 days interval gave better result by recording 37.12 tonne/ha guava yield in Ambe bahar whereas 41.62 tonne/ha in Mrig bahar. It showed that the module having physical, mechanical and chemical treatment was better than the other IPM modules. It was also noticed that foliar application of Neem oil + Imidacloprid applied @10.8l + 3.6 L/ha was found to be very effective against fruit flies.
