J. Gifford, B. F. Oliver, G. Trahan
Feb 1, 1975
Citations
0
Influential Citations
7
Citations
Journal
Journal of Economic Entomology
Abstract
Rice seed treated with pirimiphos-ethyl significantly reduced the infestation of Lissorhoptrus oryzophilus Kuschel. The optimum dose appeared to be 8oz AI/cwt since it provided highly satisfactory control of larvae that resulted in an increased yield of grain equal to the higher rates and at the same time showed more consistency among trials than the lower rates. An encapsulated formulation provided slightly better control with longer residual effects than emulsifiable concentrate and seed dressing formulations. The 8 oz rate of encapsulated formulation reduced larval infestation as much as 94% up to 58 days after flooding the rice seedlings. Rice seedlings protected by the 8 oz encapsulated pirimiphos-ethyl seed treatment in 1971 trials had almost twice as much root mass, 26% greater vegetative dry weight, and were 8% taller with 76% more tillers. In 6 trials of 1971–72, the 8-oz rate yielded a mean of 571 lb (range 383–855) more rough rice/acre than the untreated check.