EFFECT OF TEMPERATURE ON RICE BROWN PLANT HOPPER (Nilaparvata lugens Stall)
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Rice (Oryza sativa L.) is one of the worldâ€™sÂ most important food crop and is the most widelyÂ consumed staple food for a large part of the worldâ€™sÂ human population, especially in Asia. The average per hectare yield in the country tends to be relativelyÂ low compared to China, Sri Lanka, mainly due toÂ heavy losses caused by pests. Rice crop is attackedÂ by 800 species of insect pests in both field andÂ storage. Among these one of the most economicallyÂ important insect pests is the Brown planthopperÂ (BPH), Nilaparvata lugens (Stal.) (Homoptera:Â Delphacidae). The BPH has become moreÂ problematic, posing a threat to rice productionÂ throughout South and South East Asia. Due to
infestation plants turn yellow and dry up rapidly. AtÂ early infesta tion, round and yellow patches appear,Â which soon turn brownish due to the drying up of the
plants and is called as â€˜Hopper burnâ€™ which is reportedÂ to cause yield loss ranging from 10-75% (TirumalaÂ rao, 1950).