At present, summer corn has entered the most vigorous nutrient growth period, growing very rapidly, but another pest has quietly invaded China, according to the statistics of the plant protection department has entered most of the provinces south of the Yellow River in China. The harm of the insect is very alarming, the elderly larvae can eat 3 leaves in 1 day, and can eat a corn leaf in 3 days, which has attracted great attention from the agricultural department.
Main features
This pest is the grassland night moth, the grassland night moth is following the American white moth, American spotted diving fly, whitefly, whitefly after another invasion of China's foreign pests, the insect can harm more than 80 kinds of crops, especially the most like to eat corn leaves, since last year in China's Yunnan, Guangxi, Guangdong first discovered, has been found in China's 17 provinces and municipalities, but also at a rate of more than 100 kilometers per day to expand north, has become the main pest on summer corn.
Morphological characteristics
The grass moth is somewhat similar to the twill moth, the beet moth, and the corn armyworm, and the larvae are 6 years old, with a variety of colors, and the most prominent feature is an inverted "y" shaped white suture on the head. When grown, it remains green or pale yellow, with a black dorsal midline and valve line. There are 4 large black spots arranged in a square arrangement on the back of the 8th abdominal segment. In line with these two characteristics is the grassland nightcrawler.
Harmful symptoms
Grassland night moth is currently mainly harmful to summer corn, after the young larvae harm the corn leaves, the leaves form a transparent film-like "window hole", with the increase of insect age, the larvae above 3 years of age increase the amount of food, after the leaf is killed, there are holes of different sizes on the leaves, after the harm of the elderly larvae, the harm is more serious, and the whole leaf can be eaten in 3 days. Causes plant death.
Prevention and control methods
(1) Strengthen monitoring: At present, agricultural departments around the country are monitoring the occurrence of the insect, and farmers and friends should often go to the corn field to check, generally not more than 3 days. Egg masses and larvae should be removed and prevented in time.
(2) Pharmaceutical control: due to the rapid development of the insect, the harm is serious, it is necessary to use pesticides with good quick-acting properties for prevention and control, here, Xiaobian recommends several pesticides with good effect: 20% chlorhexaben parabenamide suspension 1500 times liquid + 2% avermectin emulsion 2000 times liquid; 35% methoxy indinavir suspension 2000 times liquid; 25% ethyl polybactericide water dispersible granules 2000 times liquid and other pharmaceutical spray control, sprayed every 5 days, sprayed 2 to 3 times.
Special reminder
The harm of the grassland night moth is very serious, and it must attract everyone's attention, otherwise, the corn may be harvested.
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