The knowledge I bring to you today is about the corn borer stem nocturnal moth. Also known as the corn-dead heart nocturnal moth, it belongs to the order Lepidoptera, noctuidae. Its larvae generally harm crops such as corn, millet and sorghum at the seedling stage. It is one of the main pests of corn.
Occurrence rules and hazard characteristics: Corn tooth decay moth generally occurs once a year, the eggs overwinter on the weeds, and hatch in early to mid-May of the following year. The hatching larvae feed on the rejuvenating weeds and turn to the maize in early June, which is the peak of the hazard before and after the seedlings. The larvae mostly moth from the underground part of the maize seedling stem and gradually feed upwards. The damaged corn seedlings withered, a few even cut off the young stems of corn, the larval damage period is about a month or so, at the end of June in the vicinity of the victim plant 5-16 cm underground pupate, early July for the pupal peak, July-August adults feathered to fly to the weeds to lay eggs, each female moth can lay more than 200 eggs, eggs for the winter. Adults have phototropism, and larvae have a habit of killing each other. May is rainy and humid, which is conducive to its occurrence.
Prevention and control measures
1. Agricultural control. Remove fieldside weeds to reduce the source of overwintering insects.
2. Chemical control. Irrigate the roots with 90% crystalline Dimethoate 1000x liquid or 80% Dimethoate Emulsion 1000x. 200 kg of medicinal solution per mu, 92.5% dichlorvos powder can also be used 1 kg, 20 kg of fine soil, sprinkled around the corn root.
The author's friendly tips: summer is a high incidence of insect pests, can not ignore any pest problems, so as not to lose our food!