Rice insect pests and their natural enemies complex in direct seeded and transplanted rice (Oryza sativa) of Chidambaram areas of Cuddalore, India (original) (raw)
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Status of insect pests in direct seeded and transplanted rice
Journal of entomology and zoology studies, 2020
Rice is the one of most important cereal food crops in India. In this view, CR Dhan 200, CR Dhan 201, CR Dhan 202, CR Dhan 203, CR Dhan 204, CR Dhan 205, CR Dhan 206, CR Dhan 207, CR Dhan 209 rice varieties were sown in experimental plots of Faculty of Agriculture, Annamalai University, Chidambaram. The experiment was laid out in Randomized block design with three replications. In India rice was mainly grown by direct-seeded and transplanted rice. To monitor the pest population by using net sweeping and method was used. The results showed that the vegetative stage maximum number of yellow stem borer was observed in the transplanted rice variety of CR Dhan 209 (5.00) and leaf folder population was maximum in transplanted rice variety of CR Dhan 204 (6.00). The peak population of the grasshopper was observed in the direct and transplanted rice variety of CR Dhan 204 (6.66) and green leafhopper was recorded in the maximum number of population in the transplanted rice variety of CR Dhan...
Journal of entomology and zoology studies, 2017
Fixed plot survey carried out during Kharif season (August to December) 2013 for insect pests and natural enemies complex of paddy ecosystem in different location of Cauvery command areas of Mandya district (nearby Vishveshvaraiah canal farm, Mandya). Among the pests, yellow stem borer, plant hoppers, gall midge and leaf folder were very severe and in case of predators, mirids and spiders were most important natural enemies. The average yield loss in rice has been estimated 21-51 %. The population of yellow stem borer was significantly positively correlated to Hymenopterans, Odonata and Staphylinids, whereas BPH is positively correlated with mirids (r=+0.770**), spider spider (r=+440*), odonatan (r=+0.700**), coccinellids (r=+0.476*), carabids (r=+0.779**) and cicindelids (r=+0.417*). In the same way white backed plant hopper, skipper, caseworm, hispa, blue beetle & grass hopper recorded positive significant and positive non-significant with the predators and parasitoids.
The relative abundance of major insect pests and natural enemies were studied at three different growth stages in seven high yielding varieties, Ranjit, Ranjit Sub-1, Bahadur, Bahadur Sub-1, Gitesh, Swarna Sub-1 and Shraboni in kharif and rabi season at Titabar, Assam during 2020–2022. White stem borer (47.49%) was the most predominantly abundant species followed by yellow stem borer (41.97%) among seven major insect pest species e.g., leaf folder, gall midge, caseworm, whorl maggot and gundhi bug in kharif season. But, yellow stem borer (48.69%) was abundantly observed followed by white stem borer (40.63%) among all major insect pests during rabi season. Both the species of stem borer gradually increased and reached peak due to availability of enough food at reproductive stage and decreased in the ripening stage in both the season comparatively higher in rabi season Leaf folder was the most abundant leaf feeder and its population abundance was higher in Shraboni (9.89%) followed by...
AGARICUS: Advances Agriculture Science & Farming
Rice as one of the main foods that experience many obstacles in doing cultivation. One of them is insect pest attack. This study aims to study the activity of insect pests that damage rice plants to inhibit their growth and development. Increasing rice production in Indrapuri District, Aceh Besar District continues to be pursued. This research activity was carried out from April to June 2019, by adopting the observation method to detect the presence of types of pests by using sweeping equipment in the form of a net at the location of rice field plots. The collection of pests from the insect group is carried out by identifying them which refers to the insect identification key. The results showed that insect and non-insect types of pests were found that were destructive in both the vetetative and generative phases to inhibit their growth and development which had a negative impact on production.
2017
An experiment was carried out under field conditions at the Zonal Agricultural Research Station (ZARS), Vishveshvaraiah Canal(V. C) Farm, Mandya district of Karnatakato study the population status of major sucking insect pests of rice in different methods of planting. Incidence of BPH was started from last of July and its mean population was observed in mechanical transplanted rice of 4.40 followed by manual (3.87) drill sown (2.16) and aerobic method (1.06) nymphs and adults per hill respectively. Whereas WBPH was recorded at 30 DAT and incidence remained up to the 90 DAT and Ear head bug incidence started with panicle initiation stage and continued till dough stage of the crop, and its mean population was non-significant differences among the different methods of planting. KeywordsEar head bug, BPH, WBPH, Rice ecosystem Introduction Rice (Oryza sativa L.), is the important cereal food of world and India. In India rice is grown over an area of 42.86 M. ha. with a production 104.3 M...
Population dynamics of insect pests in rice ecosystem
Indian Journal Of Entomology, 2021
Investigations on major insect pests in rice was carried out at the Agricultural Research Farm, Banaras Hindu University, Varanasi during kharif 2017-18 and 2018-19. Observations on Scirpophaga incertulas incidence revealed that deadhearts and white ears were observed to be maximum during 1 st week of October (40 th SMW) and 3 rd week of November (47 th SMW), respectively. Likewise, Cnaphalocrocis medinalis was observed during 1 st week of August (31 st SMW) with maximum incidence being in the 1 st week of October (40 th SMW) with 11.39% damaged leaves/ 10 hills. Nilapravata lugens appeared from 2 nd week of August (33 rd SMW) and attained its peak in 1 st week of October (40 th SMW) as 17.33/ 10 hills. The maximum incidence of Nephotettix virescens was observed in the 4 th week of October (43 rd SMW)-15.67 insects/ 10 hills. The activity of Leptocorisa acuta commenced from 3 rd week of October (42 nd SMW) and reached its peak during 3 rd week of November (47 th SMW-14.67/ 10 sweeps in nets). Correlation analysis revealed that the rainfall and evening RH exhibited a negative impact on S. incertulas, C. medinalis, N. lugens, N. virescens and L. acuta; minimum and maximum temperature, and morning RH, showed both positive and a negative impact on these insect pests of rice.
Paradigm shift of insect pests in rice ecosystem and their management strategy
Oryza, 2018
Insect population has changed both spatially and temporally over the period of time in a crop like rice. In the present study, data from the year 1965 to 2017 shows considerable increase of insect pests to 21 numbers. Their spread to large rice areas has been worked out which is a matter of concern, particularly Brown Planthopper (BPH), which has invaded all rice growing areas of the country. Present article focuses on more frequent occurrence of pests in different years related to the extent of damage incurred, which will be the principal concern of applied entomologists and farmers. Insects are classified as pests based not solely on numbers but on socioeconomic impact and on biological tolerance of the host to pest attack. In the present study, emphasis is placed upon host plant resistance to pests, proper monit oring and developing location-specific IPM packages for management of rice insect pests based on their initial populations and the processes by which they change to endemic form.