2.Distribution Distributions of 3 species are nationwide in China. Brown planthopper is most heavily distributed in southern China.Causes severe damage in valley of Yangtse River and southern paddy fields. White backed planthopper is mostly distributed in the south too,but has a wider distribution than brown. Small brown planthopper is most heavily distributed in northern China
Distributions of 3 species are Distributions of 3 species are nationwide in China. nationwide in China. Brown planthopper planthopper is most heavily is most heavily distributed in southern China. Causes distributed in southern China. Causes severe damage in valley of severe damage in valley of Yangtse Yangtse River and southern paddy fields. and southern paddy fields. White backed White backed planthopper planthopper is mostly is mostly distributed in the south too, but has a distributed in the south too, but has a wider distribution than brown. wider distribution than brown. Small brown Small brown planthopper planthopper is most heavily is most heavily distributed in northern China. distributed in northern China. 2. Distribution 2. Distribution
白背飞虱分布 ●重发区 轻发区 Distribution of white backed planthopper in China
Distribution of white backed Distribution of white backed planthopper planthopper in China in China
3.Damage 1)Hosts Brown planthopper is monophagous.Only feeds on rice and common wild rice(普通 野生稻). White backed planthopper is oligophagous. It mainly damages rice and other crops and weeds of Gramineae(禾本科). Small brown planthopper is polyphagous
1) Hosts 1) Hosts Brown planthopper planthopper is monophagous monophagous. Only feeds on rice and common wild rice ( feeds on rice and common wild rice (普通 野生稻). White backed White backed planthopper planthopper is oligophagous oligophagous. It mainly damages rice and other crops It mainly damages rice and other crops and weeds of and weeds of Gramineae Gramineae (禾本科). Small brown Small brown planthopper planthopper is polyphagous polyphagous. 3. Damage 3. Damage
3.Damage 2)Sucking sap of rice 田间为 Adults and nymphs feed on seedlings and cause leaves to yellow.This damage can be“冒穿”，“黄塘”or“塌圈” 褐飞凤为店造成的箱间穿”现象 田间为害状
2) Sucking sap of rice Adults and nymphs feed on seedlings and cause leaves to yellow. This damage can be “冒穿”, “黄塘” or “塌圈”. 3. Damage 3. Damage 田间为害状： “虱烧 ” 田间为害状： “虱烧
3.Damage 3)Females lay eggs inside of sheathes. 4)Produce excreta to cause leaf mold 5)Transmit virus diseases Many viruses infecting rice,wheat,corn are spread by the small brown planthopper
3) Females lay eggs inside of sheathes. 4) Produce excreta to cause leaf mold 5) Transmit virus diseases Many viruses infecting rice, wheat, corn are spread by the small brown planthopper. 3. Damage 3. Damage