Integrated control technology of the two-pointed moth

The genus Diptera is a Lepidoptera, Noctuidae. Distributed in Japan, the Korean Peninsula, Russia, Europe and other places. In 2005, it first sneaked into Japan's Hebei Province from Japan and North Korea. It was a new pest that harmed corn. In 2007, it occurred sporadically in Dezhou, Shandong Province. In July 2008, it discovered the adult of the genus Noctuidae in Xinxiang City, Henan Province; Over the years, it has gradually expanded. Since late June 2011, activities have been carried out in Henan, Shandong, Hebei, Anhui, Jiangsu, Shanxi and other places, which are harmful to summer maize seedlings.

Identification feature

Adults are 1-1.2 cm long, taupe or tan. There are two black spots on the front wing, and the outer edge of the black point is also next to a small white point. Individuals are significantly smaller than small tigers and cotton bollworms. The larvae are mainly 5 years old and some are 6 years old. The mature larvae are 1.4-2.0 cm in length, yellow-gray or dark-brown, and each body section has an inverted "triangle" of dark brown markings. The important feature is that the two brown back lines on the abdomen disappear into the thoracic section. The valve is black, the valve is black and brown, and the line is white. The larvae were disturbed into a "C" shape. Before the mature larvae phlegm, the body segments shortened and became stiffer and less active.

Law of occurrence

Two-pointed moths occur two generations a year. Adults have phototaxis, and the first peak period from early June to early July - the peak of overwintering adult larvae, the larvae hatched by laying eggs in the end of June to early July endangered summer maize seedlings, which is a key period for prevention and control; The second peak period from late to early August - the first generation of adult peaks, the larvae bite off the secondary roots of corn to endanger.

Hazard characteristics

1. After the corn is planted, the corn seeds are eaten.

2. In the 2-3 leaf stage of corn, the corn seedlings are bitten into holes, and the base of the stem of the corn is cratered.

3. In the 3-5 leaf stage of maize seedlings, the larvae mainly bite the base of the corn stalk, forming a 3-4 mm round or elliptical hole, cutting off the nutrient transport, causing the above-ground corn leaf to wither and die.

4. In the large corn seedlings (8-10 leaf stage), the larvae mainly bite the roots of the corn, including the aerial roots and the main roots, causing the corn to fall, and the severe ones die, causing the lack of seedlings and ridges.

Forecast basis

1. Moth amount: As of May 22, I had a total of 10 adult worms under the lamp. The first day was April 30, and on May 5 and 10, the amount of moths was 3 each.

2. Meteorological factors: According to the forecast of the Provincial Meteorological Center, the rainfall in May is relatively low and the temperature is high, which is not conducive to egg hatching and larval survival. In June, there was more rainfall and higher temperature, which was conducive to larval damage.

Farmers and friends are advised to pay attention to the pest dynamics of the two-pointed moth, and once the hazard occurs, take emergency measures to ensure the healthy growth of corn plants.

Control technology

1. Agricultural measures. When the corn is just emerging, the base cover of the corn seedlings should be removed in time to eliminate the occurrence conditions; when the dead seedlings appear in the field, the seedlings should be replenished in time, and the lodgings should be cultivated in time.

2, trapping adults. In the high incidence period of adult insects, insecticidal lamps, sweet and sour liquids, and poplar branches are used to trap insects and reduce the number of adult insects.

3. Chemical control. You can use dichlorvos, chlorpyrifos, phoxim and other chemicals to control adult worms, spray or root with chlorpyrifos, phoxim, indoxacarb, etc. to control larvae, using poisonous baits such as carbaryl, chlorpyrifos, dichlorvos, phoxim, indoxacarb Booby. It is best to control the larvae before the 3rd instar and when the larvae are 3-4 heads.

More pesticide knowledge, please pay attention to China Pesticide Network

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