Study On Plant Protection Scheme For Three Important Growth Periods Of Maize

Shandong is a large province of corn planting.At present,the area of corn is nearly 50 million mu.Maize is one of the most important crops in Shandong field crop area,and also an important source of farmers’ income.All the time,the occurrence of diseases and insect pests has caused great reduction in maize production.According to the survey of the plant protection station in Shandong Province,the production of single pest and grass damage to corn is about 15%per year,resulting in great economic loss.How to prevent and control corn disease and insect pest more effectively has become the most concerned problem of the farmers in the corn planting area.In the actual production,the two key periods of maize pest control are the big bell and the male stage of maize.Corn tasselling stage is the key period of maize growth,through the study on the prevention of several insecticides for maize Lepidoptera pests found in this period for maize pest control,can reduce the corn base,can improve the control effect of 23.7%,effective protection of the functional leaves of maize.The key period of maize pollination grouting is the period of maize pollination filling,and it is also the key period to prevent and control maize ear pests.The results showed that compared with the conventional pesticides,chlorambuteramide had a longer effective period in controlling Lepidoptera pests,and its holding period could reach 30d,which could protect maize from pests for longer.Thus,the number of the drugs is greatly reduced,and the artificial input is saved at the same time,and the production needs are greatly met.When planting corn,it is necessary to popularize the technology of high yield planting.There are several critical periods in the growth of corn,and the occurrence of corn and insect pests in this period will have a great effect on the later yield of maize.Through a series of experiments,using different intervention in various stages of plant protection,screened each time optimal control agent,worked out a set of optimization scheme,the scheme makes the corn seedling cotton seedling,seedling in maize 30d ensure the survival rate of 92%,and can promote the growth of jade Mi Jianzhuang,the average height increased 5cm,lay the foundation for high yield of maize.In the key period of maize weeding,we should prevent and control weeds while preventing pests and increase labor input.After comprehensive prevention and control,the pest control can reach 81.03%.During the long trumpet and tassel stage of maize,pest control was carried out for a long time.In the later stage,the control effect on Panicle pests reached 73.3%,which was 29.3%higher than that in conventional programs.It greatly alleviated the effect of the disease and insect on the later yield.By optimizing the plant protection plan during the critical period of corn,we can get effective prevention and control for maize diseases and pests at various stages,and at the same time,we can play a complementary role in the control time.The yield increased by 17.6%,and the yield of maize increased greatly.