Wheat moth

The scientific name Sitotrogacerealella (Olivier) belongs to Lepidoptera, Noctuidae. Distributed all over the country.

Host @, corn, rice, sorghum, buckwheat, grass seeds, edible fungi and so on.

The damage characteristics of the larvae eat the above seeds.

Morphological characteristics Adult body length 4-5mm, wingspan 14-18mm, grayish yellow; compound eyes black, antennae filiform, grayish brown; head and face densely covered with grayish brown scaly hairs; lower lip whiskers, thicker second segment, tip thin, slightly curved upward, not exceeding the top of the head; forewings gray-white, bamboo-shaped, usually with inconspicuous dark brown markings, trailing edge hair long, brown The rear wing is gray-white, trapezoidal, the outer edge is concave, the top angle is pointed and prominent, and the posterior brim is very long, equal to the width of the wing surface. The egg is oval, 0.5-0.6mm long, one end is small and truncated, the surface is longitudinally and horizontally striated, milky white to light red. The larvae are 5-8mm in body length, light red in newly hatched, yellowish white after 2nd instar, milky white in old age, small in head, dilated in chest, slightly wrinkled in each segment and tiny in chest foot, and degenerated in ventral foot, with 3 tiny brown toe hooks on the tip of each foot. The pupa is 4-6mm long, yellowish brown, thin.

Living habits: 4 Mel 6 generations in the south, 3 generations in the north, 12 generations at most in areas with high temperature, overwintering with mature larvae in grain, forming thin white cocoons before pupation, pupa stage 5 days, adults break the film and drill out of grains during Eclosion, adults like to Eclosion in the early morning, mating immediately after Eclosion, adult life span is about 13 days, 24 hours after mating, eggs are laid on the surface of the grain pile, and most eggs are laid at 7cm. Some adults fly to the field to lay eggs on corn kernels, wheat ears and rice ears, laying eggs on corn grains, wheat ears and rice ears, laying 389 eggs per female, generally 1 head on each grain, 3 corn heads, up to 10-20 grains, and the larvae can turn grains to damage, and 21Mel 35 ℃ develops rapidly.

Control methods (1) to prevent and control cereal crops in storage, to prevent wheat moths from moving into wheat or grain fields, to dry them and spread 3-5cm before storage, to keep the drying temperature up to 45 ℃ for 6 hours, can kill the eggs, larvae and pupae of wheat moths in grain. (2) after entering the warehouse, according to the proportion of each piece of aluminum phosphide fumigation grain 150-200kg, the aluminum phosphide tablets are scattered and buried in the grain stack, and then seal the grain stack tightly. When the grain is stored in the warehouse for a long time, 5 tablets are used according to the grain heap and space, and several tablets are buried in each place in the 50cm under the grain surface and around the granary. The medicine is sealed after administration, and the temperature is 20 ℃ and fumigated for 3 days for 4 days. (3) the control in the field is mainly to kill eggs and newly hatched larvae, and eliminate them before drilling. The specific method is from the peak spawning period to the egg hatching peak period of the local wheat moth, when there are more than 2 eggs per ear, 50% phoxim EC or 40% omethoate EC 75ml or 20% butyl EC 30ml are sprayed per 667m2, and the effect of spraying water 50kg or water 20kg is obvious.