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随着农业生产的发展,耕作制度的变革,施肥、密植水平的提高,新技术、新品种的采用,必然引起病虫害的生态环境发生重大变化,病虫害的种群分布和数量变动,也会产生新的情况,昆虫相重新组合,一些过去严重的病虫害可能为害减轻,也可能更重,而另一些少发生的病虫引起常年猖獗为害,还可能出现一些新的病虫害。例如北方稻区为害较重的稻潜叶蝇,由于本省推广早播小苗而引起普遍为害,1971年安义、奉新等地大面积发生,引起严重死苗。又如1973年井冈山地区农科所大面积种植具有高粱血统的井农5号,而引起稻蚜严重发生。增加施肥量,提高密植程度而引起苗瘟病、纹枯病发生的事例,更累见不鲜。
With the development of agricultural production, the transformation of farming system, the improvement of fertilization and planting density, the adoption of new technologies and new varieties will inevitably lead to great changes in the ecological environment of pests and diseases, the distribution and quantity changes of pests and diseases will also produce new In the case of insects, some new pests may be reorganized. Some past pests and diseases may be lessened or heavier while others less prone to perennial pests may cause pests. Some new pests and diseases may also occur. For example, the rice crop in the northern rice paddy region, where the damage is heavier, has been widespreadly damaged due to the promotion of early-sowing seedlings in the province. In 1971, large areas of An Yi and Fengxin took place, causing severe dead seedlings. Another example is the 1973 Jinggangshan area agricultural science and technology to grow a large area with sorghum lineage wells agricultural 5, causing aphid serious occurrence. Increase the amount of fertilizer to increase the degree of close planting caused by the blast, sheath blight occurred in the case, even more uncomfortable.