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The brown planthopper IViloparuata tugens is a serious pest in Asia. It darnages the rice plant by sucking the plant sap and by transmitting the grassy stunt virus disease. Apparently the heavy tlllering and shortstatured rice varieties grown with high rates of nitrogen fertilizer favor the population build-up of this species. Censequently its relative importance has increased during the past few years. In a greenhouse experiment at the International Rice Research Institute (IRRI), IR9-60 rice plants infested at 25 and at 50 days after transplanting with 400 newly hatched brown planthopper nymphs wilted and completely dried up in 3 and in 15 days, respectively(PATHAK, 1969). Such damage te the plants is termed "hopperburn". Lower insect populations caused reduced tillering, reduced crop vigor, fewer panicles, and higher percentage of unfiIIed grains (BALE and PATHAK, 1970). Basic infbrmation as te how the brown planthopper causes the browning and wilting of the rice plant, the typical characteristics of hopperburn, is still speculative, However, SoGAwA (I971) fbund a progressive decrcase in total protein and an increase in free amino acids, particularly arginine, asparagine, and glutamine in leaf blacles from feeding rice plants to the brown planthopper, Some possible causes ofhopperburn produced by ether species of sucking insects on their host plants have been reported, however. Studies in potato, for instance, showed that mechanical plugging of the xylem and phloem vessels of the host plants by tissues pushed into these vessels during the exploratory feeding of the potato leafhopper, Empeasca fabae, restricted the movement of sugars and starches in the leaves and in the meristematic tissue (DE LoNG,

Metabolic Changes in the Rice Plant during Infestation by the Brown Planthopper, Nilaparvata lugens ST&Aring;L (Hemiptera : Delphacidae)

Metabolic Changes in the Rice Plant during Infestation by the Brown Planthopper, Nilaparvata lugens STÅL (Hemiptera : Delphacidae)