Studies on Insect Pests and Their Predators in Upland Rice Ecosystem
Loading...
Date
2011
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UAS, Dharwad
Abstract
A study was conducted on the insect pests and predators of upland rice
ecosystem at ARS (Paddy), Mugad during kharif 2010. The blue beetle, leafhopper
and horned caterpillar appeared in the vegetative phase of the crop and their
population was significantly high in drill sown rice, compared to transplanted and
aerobic rice. Leaf folder incidence was recorded throughout the season under all the
planting methods. Drill sown rice crop supported significantly higher population
when compared to aerobic rice. A meager population of grasshopper and earhead bug
was recorded across the method without any statistical difference. Yellow stem borer
population was significantly high in aerobic method during reproductive phase of the
crop. The coccinellids, predatory spiders, ground beetle and odonata population were
recorded throughout the season in all the three rice planting methods. The predatory
spiders population was significantly high in drill sown and transplanted rice,
compared to aerobic crop. The coccinellid, ground beetle and odonata were found
throughout the season without any distinct population pattern across the planting
methods. Among the newer insecticides and botanical evaluated against leaf folder,
emamectin benzoate 5 SG @ 0.25 g/l, spinosad 45 SC @ 0.2ml/l and flubendiamide
480SC @ 0.2 ml/l recorded lowest per cent leaf damage. Similarly, emamectin
benzoate, bifenthrin, profenophos, chlorfenpyr and thiocloprid were more toxic to the
predatory spiders. The highest grain yield, net profit and B:C ratio was recorded in
emamectin benzoate treatment. Among the rice varieties screened against rice leaf
folder, Dambarsali, Ratansagar, Champakali, M-18, J-192, Kari Kantiga, Hybrid 258-
1, Kannanur local, Chitiga, MGD-103, MGD-105, MTU-1010, Amrut, MAS-26,
ARB-6,and Rajmani showed resistant reaction. All the resistant cultivars showed
hairiness as against smooth surface in moderately susceptible and susceptible
varieties.
Description
Keywords
Agricultural Entomology