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塑膜覆盖种植的棉花,约有三分之二的地面被塑膜覆盖,地温明显提高,土壤湿度加大,棉花出苗早,生长发育快,较对照提早出苗5—7天,生育期提前10—15天。 由于棉田生态条件发生了改变,因此,地膜棉田病虫害的发生期、发生量也相应改变。据我们观察,病虫害发生期偏早三、五天。虫害方面,苗期主要害虫有棉蓟马、苜蓿蚜、地老虎;蕾铃期有盲椿象、棉铃虫;中后期有红蜘蛛。病害方面,苗期有烂根病;
About two-thirds of the ground is covered with plastic film, the ground temperature is significantly increased, the soil moisture is increased, the cotton emerges early and the growth is fast. Compared with the control, the emergence of cotton is 5-7 days earlier and the growth period is earlier than 10 -15 days. Due to the change of ecological conditions in cotton fields, the occurrence and occurrence of pests and diseases in the plastic film cotton fields also change accordingly. According to our observation, pests and diseases occur earlier than three or five days. Pests, the main pests in the seedling cotton thrips, alfalfa aphids, to tiger; budding period blind stinkbug, cotton bollworm; in the late red spider. Diseases, seedling rotten root disease;