Effect of date of transplanting and some commonly used insecticides against insect pests infesting rice in tarai region of Uttarakhand

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dc.contributor.advisorPandey, A.K.
dc.contributor.authorDogra, Rajnni
dc.date.accessioned2022-10-16T07:28:35Z
dc.date.available2022-10-16T07:28:35Z
dc.date.issued2022-09
dc.description.abstractThe present investigation was carried out during kharif 2020 and 2021 at Norman E. Borlaug Crop Research Centre, G. B. Pant University of Agriculture and Technology, Pantnagar to study the effect of planting date on the incidence of insect pests of rice and to evaluate some novel insecticides against rice insects. Total 07 chemical insecticides with a control were evaluated separately in three different fields against insect pest of rice under Randomized block design with three replications of each. In first insecticidal experiment, after the 1st application of insecticides, granular formulation of insecticides, in the field 2nd and 3rd application in which insecticides were sprayed with different combinations made in 7 treated plot and an untreated plot was left. The observation was recorded weekly intervals during the incidence of insect pest while in insecticidal experiment the observation was recorded one day before application and at 10 days’ interval after application of insecticidal treatments. It was observed early planting gives suitable conditions for the crop and manage the insect population, the damage due to sucking pests is either found more or less similar in normal and late plantings or maximum damage was recorded in late planting. It was found that early planting (30 June) reduced the incidence of insect pest in rice as compared to normal (15 July) and late planting (30 July) crops. The incidence of yellow stem borer, leaf folder, rice hispa, whorl maggot, brown plnt hopper, white backed plant hopper and gundhi bug was low in early sown crop with the exception of green leaf hopper which had the minimum overall population during normal planting and high damage is seen in early planting as compared to others. The pre-harvest data and yield analysis shows significantly low white ear heads of rice high yield (42.68 qha-1) in early planted crop as compared to timely (15.38 qha-1) and late sown crop (3.48 qha-1). There was significant difference among the yield recorded in early, normal and late transplanted crop.Among the insecticidal treatment, sequential application of fipronil granule – chlorantraniliprole SC – chlorantraniliprole SC at 10 days’ intervals was found to be best treatment (0.33%, 0.55%; 0.31%, 0.21% and 1.55%, 1.30%) whereas for leaf folder application of chlorantraniliprole granules followed by chlorantraniliprole SC further followed by sequential application of chlorantraniliprole granule- cartap hydrochloride gave the better results (0.22%, 0.18% and 0.17%, 0.13%) as compared to rest of the treatments. However, all the treatments were significantly superior over control. For all sucking insect pest like green leafhopper, brown planthopper and white backed plant hopper, application of fipronil granules 0.3 GR (@ 10 kg/ha) followed by fipronil 5 SC (@ 1000 ml/ha) spray was the most effective treatment (0.03, 0.10; 0.17, 0.10; 0.17, 0.23) after the second spray. After the third spray triflumezopyrim showed the best results in controlling GLH, BPH, WBPH as well as gundhi bug as it reduces the population to zero in case of all sucking insects. Application of fipronil granule (0.3 GR @ 10 kg/ha) followed by chlorantraniliprole 20 SC (@ 150 ml/ha) and repeated with another spray of chlorantraniliprole SC 20 SC (@ 150 ml/ha) recorded the maximum per cent yield increase (31.75 and 9.03 qha-1) during both years of study. In another experiment of insecticidal management of insect pest infesting rice, flubendiamide 480 SC had recorded maximum control of yellow stem borer (0.78%, 0.74% and 0.61%, 0.32%) and leaf folder (0.21%, 0.14% and 0.15%, 0.13%) followed by chlorantraniliprole 20 SC (2.62%, 2.32%; 1.84%, 1.10% and 0.65%, 0.56%; 0.61%, 0.54%). However, fipronil 15 + imidacloprid 5 SC (@ 500 ml/ha) spray was found to be the best treatment (0.03, 0.03 for green leaf hopper; 0.17, 0.17 for brown plant hopper; 0.07, 0.07 for white backed plant hopper and 0.07, 0.03 for gundhi bug). In the third insecticidal treatment, in which the sane treatments were used but only single spray was done before the panicle initiation stage, also flubendiamide 480 SC (@ 75 ml/ha) was the best treatment for the control of yellow stem borer and leaf folder (2.17%, 1.56% and 0.25%, 0.23%). For the sucking pests fipronil 15 + imidacloprid 5 SC (@ 500 ml/ha) spray was the best treatment (0.10, 0.07 no. of green leaf hopper; 0.17, 0.13 no. of brown plant hopper; 0.13, 0.07 no. of white backed plant hopper and 0.1, 0.07 no. of gundhi bug). The highest per cent increase in yield over control was recorded in treatment 1 chlorantraniliprole 20 SC (14.92, 29.74 and 13.29, 13.33 no. of insect) in both the experiments.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810189005
dc.keywordsinsecticides, Uttarakhand, riceen_US
dc.language.isoEnglishen_US
dc.pages139en_US
dc.publisherG.B. Pant University of Agriculture and Technology, Pantnagar, District Udham Singh Nagar, Uttarakhand. PIN - 263145en_US
dc.research.problemRiceen_US
dc.subEntomologyen_US
dc.themeInsecticidesen_US
dc.these.typeM.Scen_US
dc.titleEffect of date of transplanting and some commonly used insecticides against insect pests infesting rice in tarai region of Uttarakhanden_US
dc.typeThesisen_US
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