Knowledge Bank | 農藥合法資訊網
N.lugens,thericebrownplanthopper(BPH)wasarelativelyminorricepestpriortotheGreenRevolutionandtheassociatedincreaseinpesticideuseinrice.
IntroductionN. lugens is probably the most serious insect pest of rice in Asia. Its feeding causes plants to wilt and causes a symptom called hopperburn. It also transmits grassy stunt and ragged stunt virus diseases (Reissig et al., 1985). N. lugens was a minor rice pest until the mid-1960s in much of tropical Asia (Pathak and Dhaliwal, 1981). However, it assumed the status of the most destructive pest in the 1970s (Heinrichs and Mochida, 1984).
Colonization and Damage
Hopperburn, which is a characteristic symptom of N. lugens damage, does not usually appear until the crop reaches the milk or dough stages; in its vegetative stage, rice can tolerate a population of 100 to 200 nymphs/hill without showing any outward symptom of injury on the plants. Therefore, hopperburn appears at a very late stage of infestation (Kulshreshth et al., 1976).
When the food resources availab...
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