First, the morphological characteristics
Two oviposition moths are Lepidoptera. Eggs are head-shaped, with longitudinal ridges, yellow-green in the beginning, yellow soil in the late, and less than 1 mm in diameter. The larvae have a body length of 14-18 mm, yellowish gray or dark brown. The distinctive features are dark brown stripes with an inverted triangle on the front edge of each somite, two brown dorsal lines on the back of the abdomen, disappearance of the thoracic tract, and aging. Larvae body length of about 20 mm, brown head, body grayish yellow, into the soil to do phlegm, maggot length of about 10 mm, early phlegm pale brown, gradually turning brown. Adults are 10 - 12 mm in length and 20 mm in wingspan. The female body is slightly larger than the male, head, chest, abdomen gray-brown, grayish brown fore wing, a black spot on the outer edge of the wing, white and brownish hind wings, dark brown in the end zone, grayish brown on the abdomen (color picture of insects from Shaanxi Plant Protection Information Network Download and Download).
Second, the occurrence of hazards
Two-spotted moths are larvae hiding under the crushed wheat straw around the corn seedlings or in the 2-5 cm topsoil layer that harms corn seedlings. At the 3 to 5 leaf stage of corn seedlings, larvae mainly bite the base of the corn stem, forming 3 - 4 Millimeter round or elliptical holes cut off nutrient transport, causing the wilting of the heart of the corn. During the 8 to 10 leaf stage of corn seedlings, larvae mainly bite off the roots of corn, including aerial roots and main roots, resulting in corn lodging and severe death. Because the insect lurks under the crushed wheat straw in the corn field and damages the roots and stems of the corn, spraying is generally not effective.
Third, control methods
In the prevention and control, it is necessary to grasp the early prevention and early control. When it is found that individual plants in the field are tilted, the prevention and treatment should be started immediately.
1. Agricultural measures: timely remove wheat straw, weeds and other coverings at the base of corn seedlings.
2, chemical control:
(1) Poison bait. Mu 2-3kg of fried wheat bran and 48% of chlorpyrifos EC 300g were mixed into appropriate baits, and they were sprinkled on the corn base in the evening.
(2) Toxic soil. Mu with 80% dichlorvos EC 300 ml mix 25Kg fine soil, spread the corn base along the morning ridge, better control effect.
(3) Dosage. With water irrigation, mu 48% chlorpyrifos EC 1kg, poured into the field when poured.
(4) drip irrigation application. It is possible to unscrew the sprinklers of the workers and peasants 16 type sprayers, and drip the medicinal liquids one by one, or spray the stems with a straight nozzle. Pharmacists can choose 48% chlorpyrifos EC 1500 times, or 4.5% cyfluthrin EC 2500 times. The amount of liquid should be large to ensure that penetrants around the roots of corn are easily hidden.
Penta Prism
Product Description:
Right Handed Image
Optical Tool for Defining a Right Angle
Additional Penta Prism Options Available
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