Ma Tian Asian corn borer

Scientific name Ostrinia furnacalis (guenee) Lepidoptera, Gnatidae. The common name is wormworm, stalkworm. Distributed in our Ma production area.

Host kenaf, long fruit species of jute, hemp and other crops.

Characteristics of damage The larvae invade from the upper part of the kenaf stalk, and there are dirty yellow insects piled on the outside of the bore hole. 4 The affected plants are easily broken or blown off by the wind, and sometimes they are stumped and cause leaf wilting. Morphological characteristics Adult body length 10-13mm, wings 24-35mm, brown moth. The female moth has bright yellow wings. The fin bases 2/3 have brown stripes and a brown corrugation. The outside has a yellow zigzag line. There are yellow serrated spots outside and yellow brown spots outside. The male moth is slightly smaller and its wings are slightly darker; the head, chest, and front wings are tan, and the back of the chest is light yellow-brown; the horizontal lines of the forewings are dark brown, corrugated, the inside is tan, and the base is brown; the outer horizontal lines are dark brown and jagged. Outer brownish brown, outward brown belt parallel to outer edge; brown between inner horizontal line and outer horizontal line; brown inner side of marginal hair, lateral white; hind wings pale brown, central has a light-colored broadband, near outer edge Yellow-brown band, semi-brown inside margin hair, half white outside. The eggs are about lmm long, oval-shaped, squama-shaped arranged into egg masses. They produce milky white, translucent, and then turn yellow. The table is reticulated and shiny. Larvae body length of about 25mm, dark brown head and pronotum back, body back light grayish brown, light red or yellow, etc., 1st to 8th abdominal section has two columns of hair tumors, the front row of 4 to the middle 2 Large, round, rear two. The dragonfly is 14-15mm long, yellowish-brown to reddish-brown, and the 1-7th abdominal mask has two rows of bristles. The hip spine is prominent, dark brown.

Habits of life The Yangtze River Valley area is 3-4 generations old, with mature larvae in the corn, sorghum and other host straw overwintering. The newly hatched larvae first take egg shells at the egg masses and begin crawling or drooping after 1 hour. The larvae on one egg mass can be expanded to l0 to several dozen strains. After hesitated into the hemp stem damage.

Control methods (1) Dispose of crop stalks such as corn and sorghum in a timely manner before the Ching Ming period to reduce emergence and oviposition of overwintering larvae. (2) Using the Asian corn borer's habit of spawning on terrapins, cultivating the arachis around or in the vicinity of Ma Tian lures the worm. (3) Strengthen the control of aphids in corn fields, use 50% parathion EC per 667m2 of corn field for 500mL, dilute with water 10l, mix in 25k8 sieved cinder particles, and prepare 1% parathion EC Granules. In the unexpired stage of corn leaf, timely application into the 4-5 leaves of the corn leaf cluster, multiple strains of granules 1.5-2g. Also available phoxim granules 250g, mixed with 3-4 kg of coal residue; Bt emulsion 150mI can also be mixed with 15kg fine soil made of granules, sprinkled in the corn leaves bell. (4) The fumigation method uses 80% dichlorvos emulsifiable concentrate 125ml per 667m2, soaks 50 corn stalks, and evenly inserts them into the Ma Tian during the period of adult emergence and killing adults, which can reduce spawning. (5) When necessary, in the high hatching period of corn borer, spray 50L of water with every 667m2 of 5% Regent suspension 30-35mL or 20% fenvalerine buttermilk 40mL.

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