Maize in the main producing areas of spring maize in northern China

Meteorological conditions in the main spring maize producing areas in northern China have been favorable to the occurrence and development of corn borer since May .

In May 2011, most of the spring maize producing areas in the north were mostly normal in precipitation, and the temperature was slightly higher. This provided favorable conditions for the larvae of wintering larvae. In June, except for the slightly lower temperature in the eastern part of the Northeast, the temperature in the western part of the northeastern part, the northern part of North China and the western part of the northwestern part of the northwestern part of the northwestern part of the country was higher than that of the normal year. The precipitation was basically close to the normal year; there was no large-scale high temperature, strong precipitation, etc. Extreme weather inhibits the development of corn borer. The growth and development of corn borer is close to normal. Linyi Fertilizer Network Copyright

Since July, the temperature of the main spring maize producing areas in the north is close to normal. The temperature in the eastern part of Northeast China and the eastern part of North China is slightly higher than that in normal years; the precipitation in most parts of Heilongjiang and northwest Shaanxi is more than 2 to 50%. The moderate temperature and rainy meteorological conditions have created suitable conditions for the hatching and harm of the corn larvae. Linyi Fertilizer Network Copyright

In the middle and late July of 2011, most of the first generation of corn pupa in the main spring producing areas of northern spring corn developed and developed .

At present, the corn borer in the north-central part of Northeast China has entered a period of hatching; the southern part of the northeastern region, the north of China and the northwestern part of the northwest have successively entered a generation of larvae. It is predicted that there will be more precipitation in the southeastern part of Northeast China in the middle and late July, which is conducive to the hatching and harm of the corn larvae. According to the comprehensive analysis of the development of meteorological conditions and meteorological grade prediction model of corn borer: in the middle and late July of Heilongjiang, eastern Jilin, southeastern Liaoning, the development of meteorites with high meteorological conditions is conducive to the occurrence and damage of corn borer; most of Heilongjiang, The occurrence of meteorites in Jilin, Liaoning, central and western Liaoning and North China is relatively high, and meteorological conditions are more conducive to the occurrence and damage of corn borer. Linyi Fertilizer Network Copyright

Mid-July, mid-July, the main production area of ​​northern spring maize, corn pupa, development, meteorological grade forecast, Linyi Fertilizer Network

Prevention and Control Suggestions Linyi Fertilizer Network Copyright

At present, the first generation of corn glutinous rice in the main producing areas of northern spring maize is suitable for prevention and control. All localities should closely monitor the insects, and actively adopt biological and physical measures such as releasing Trichogramma, insecticidal lamp trapping and other biological measures to prevent and control the land. Take measures such as chemical injection, spray, etc. to prevent and control. Linyi Fertilizer Network Copyright

Note: The larvae of the wintering larvae of the corn borer are hatching and hatching after the emergence of the larvae in the next year. The first generation of larvae mainly feed on corn leaves or drill stalks after corn heading, causing the development of female ears to be hindered and reduced, which is the main pest that harms the production of spring corn in northern China. Linyi Fertilizer Network Copyright

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