High-resolution map and control methods of rice blast

High-resolution map and control methods of rice blast pests and diseases, rice genus Lepidoptera, Noctuidae. Distributed in the eastern half of China's rice region. The larvae feed on the leaves and eat into nicks. When severe, the seedlings can be eaten into a knife-shaped shape, and the Honda rice plant is eaten as a "broomstick."

Morphological characteristics of rice blast

The adult body is 6-10 mm long and has a wingspan of 16-24 mm. The male moth is yellow-brown and has a deep yellow forefoot. The upper two are nearly parallel purple-red oblique bands, and the hind wings are dark brown. The female moth is yellow in color, with a yellow-brown front wing and two intermittent purple-red oblique bands. The hind wings are light yellow. Overwintering adult body, wing color and oblique color are deep. Eggs are hemispherical, purplish red or dark purple, with a square-shaped engraving on the surface. The larvae of the last instar are green, the valve line is pale yellow, and the first pair is a papillary shape of the abdomen and arches when walking. It is brown in color and has a golden luster when it is near feathering.

Rice blast occurrence

Three to six generations occur in a year, so that wintering occurs in the rice bush or weed leaf or between the leaf sheath. Adults are more likely to emerge in the morning, lurking in the rice bushes and weeds during the day, mating and spawning at night, and the eggs are mostly produced on the leaves or sheaths. The larvae like to hatch in the morning, stay still on the leaves during the day, and feed on night or rainy days. After the larva is matured, the tip of the leaf is often folded into a triangular worm, and then the lower part of the worm is bitten off, so that it falls on the surface of the worm, and the sputum is thinned. Common natural enemies include Trichogramma ostriniae, Trichogramma, and black beetle.

Rice paddy rice control method

Rational fertilization, strengthen field management to promote healthy growth of rice to reduce damage. Biological control, artificial release of Trichogramma.

In the early stage of larval hatching, the following agents can be used: 80% insecticidal single powder 35-40g/mu; 90% crystal trichlorfon 600 times liquid; 5% butene fipronil suspension 20ml/mu; 10% imidacloprid wettable powder 10-30g/mu, evenly spray 50-60kg of water; 50% killing sulphur-phosphorus emulsifiable concentrate l00ml/mu, pouring water 400kg.

This article URL: HD map of rice blast pests and diseases and prevention methods

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