Yield loss of soybean caused by insect pests of pod
1998
Srisamorn Pitaksa(Department of Agriculture, Bangkok (Thailand). Entomology and Zoology Division) | Turnjit Sattayavirut(Department of Agriculture, Bangkok (Thailand). Entomology and Zoology Division) | Boontiwa Watiroirum(Department of Agriculture, Bangkok (Thailand). Entomology and Zoology Division)
Field experiment were conducted at Chiangmai during 1988-1997 to determined the yield loss of soybean caused by two insect pests of pod, bean bug (Riptortus linearis) and cotton bollworm (Heliothis armigera). To determined the yield loss caused by bean bug, different number of adult of bean bug, R. linearis with 0, 1, 2, 3, 4 and 5 individuals per caged were released at R sub(4) growth stage of soybean and kept constant until plant were harvested. It was found that the number of adult of bean but had influence on yield of soybean. There was negative correlation between the number of bean bug and yield. A linear regression was fitted between the number of insects and yield, the regression equation was Y = 45.73 - 6.74 X, where Y = yield of soybean and X = the number of bean bug and R sup(2) = 0.83. To determined the yield loss caused by cotton bolloworm (H. armigera), pod of soybean were removed for 10-70 percent at R sub(4), R sub(5) or R sub(6) growth stage. The results showed that yield was not decreased at 10-20 percent pod removed at R5 stage of soybean.
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