Studies on the avoidable losses caused by whitebacked planthopper<i>Sogatella furcifera</i>Horvath on rice protected at different growth stages after different insecticide treatments

Kushwaha, K. S.; Mrig, K. K.; Kapoor, T. R.

doi:10.1080/09670878609371020

Cited by 6 publications

(1 citation statement)

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“…One method of assessing yield losses due to insect pests is by comparing the yields of crops protected with insecticide with those not protected (Israel and Abraham, 1967;Ukwungwu and Odebiyi, 1984;Kushwaha et al, 1986). The technique may not provide a realistic estimate of yield loss because the insecticides may have a phytotonic effect, which increases crop vigour and yield in ways unconnected with control of the target insects (Hardas era/., 1972; Daynard ef a/., 1975;Nayeem and Bapat, 1976;Tsai, 1978;Venugopal and Litsinger, 1984).…”

Section: Discussionmentioning

confidence: 99%

Comparative observations on the pest and disease incidence and yield losses of Japonica, Indica and Japonica × Indica rices

Bleih¹,

Sagun

Ramachandran

1991

Tropical Pest Management

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Comparative field observations of pest incidence on five selected varieties each of Japonica, Indica, and Japonica × Indica rice types indicated that tungro incidence was relatively higher on Japonica varieties, while stem borer incidence at heading stage was higher on Indica varieties. No differences in the relative abundance of other pests on these rice types were observed. Insecticide treatment and caging of plants reduced pest incidence on all varieties. Plant growth and yield of insecticide-treated plants were significantly higher than unprotected plants. Caging reduced the number of tillers but the yields remained higher than unprotected plants. Yield loss estimated by the insecticide protection method was higher at 39% than that by the caging method at 25% overall. There was a significant positive correlation between yield loss estimated by the two methods in Indica and Japonica × Indica varieties and no such relationship in Japonica varieties.

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Section: Discussionmentioning

confidence: 99%