据30个省(区、市)有关数据统计,今年上半年全国主要林业有害生物呈偏轻发生态势,发生面积10,602万亩,与去年同比下降16%。专家预计,下半年全国主要森林病虫害发生面积4000万亩。专家说,由于去冬今春气温偏低,夏季大雨不断,对上半年林业有害生物的发生产生抑制作用,食叶害虫发生 According to the statistics of 30 provinces (autonomous regions and municipalities), in the first half of this year, the major forestry pests in the country showed a slight tendency with an area of ​​106.02 million mu, down 16% from the same period of last year. Experts predict that in the second half of the year, the area of ​​major forest pests and diseases will reach 40 million mu. Experts said that because of the low temperatures in winter and spring, heavy summer rains continue to dampen the occurrence of forestry pests in the first half of the year, and leaf-feeding pests occur