Due to the long duration of cold weather in spring 2010, the occurrence of corn borer is serious. The Horticulture and Animal Husbandry Bureau of Horqin District organizes technical instructors to do well in training and prevention work.
First, the introduction of corn borer The corn borer, also known as corn borer, morphological characteristics: adult head is dark brown, coleopteran green beetle. It is 5 mm in length, dark brown on the front and small dots on it, with a green sheen. Feet deep yellow, dark brown belly. At the end of the abdomen, females are semi-ovoid, slightly over the ends of the elytra, and the male does not exceed the tip of the wing sheath. The egg is elliptical, about 0.6 mm long, and the egg shell is smooth. It produces yellow color and turns brown before hatching. The larvae are yellow, brown head, body length 12 mm, and 11 knots. Each section is arranged with dark brown spots on the back of the body and the chest shield is yellow-brown. Yellow, naked, 6 mm long.
Second, the damage to the symptoms of crop corn, damage symptoms: from the end of May to early June corn borer began in the surface near the ground 2-3 cm root base or junction into the junction. The boring hole has a nearly circular or elongated rift and is brown. The harmful pathogens in the soil can easily infect plants from the pod borehole. The middle and upper leaves gradually appeared yellow-green stripes, and the damage to the growing points caused dwarfing of the plants, and the leaves were clustered with clivia. The symptoms of yellow-green stripe began to appear in 8–10 days after the damage of corn borers, and the duration of the yellow-green stripes and the degree of dwarfing of the plants were closely related to the age of the leaves. In the 6-8 leaf stage of the maize, the damage was heavy. In severe cases, individual leaves faltered or appeared rows of holes, and the heart was wilted. The field symptoms of corn borer plants are similar to maize virus disease and zinc deficiency. The main difference is that brown boring or cracks are left on the roots of corn after the damage by the rotets. When the plants show obvious symptoms, the pests have been transformed and the insects are hard to find.
Third, the incidence characteristics of corn borer in the north of the year l generation, with eggs in the corn soil winter. From May to early June, the wintering eggs hatch one after another, and the larvae feed on the corn seedlings. Many seedlings can be transferred and infested in the maize seedling stage. After the seedlings reach a length of nearly 30 cm, they are rarely replanted and the larvae damage period is approximately one and a half months. In the middle and late July, after the larvae are matured, earthworms are released on the surface and the adults are bred in about 10 days. Adults are active during the day and live in the night at night. Once they have a false animation, the adults produce more eggs in the loose corn field. Each female can lay 1Q granules and more than 20-30 granules.
Fourth, the prevention and control methods (a) agricultural control law to carry out a reasonable rotation to avoid planting crops in order to reduce hazards.
(II) Chemical Control
1. Use 25% Carbaryl (Carbaryl) WP per acre, or 2.5% of trichlorfon powder, 1 to 1.5 kg, mix 20 kg of fine soil, and mix well until the early stage of larval damage ( Maize seedling stage) Shun pests spread around the corn, killing and harming pests.
2, with 90% crystal trichlorfon 1000 times, or with 80% dichlorvos EC 1500 times spray, spraying liquid per acre 60 to 75 kg. Common agents: Carbaryl, trichlorfon, and dichlorvos EC.
First, the introduction of corn borer The corn borer, also known as corn borer, morphological characteristics: adult head is dark brown, coleopteran green beetle. It is 5 mm in length, dark brown on the front and small dots on it, with a green sheen. Feet deep yellow, dark brown belly. At the end of the abdomen, females are semi-ovoid, slightly over the ends of the elytra, and the male does not exceed the tip of the wing sheath. The egg is elliptical, about 0.6 mm long, and the egg shell is smooth. It produces yellow color and turns brown before hatching. The larvae are yellow, brown head, body length 12 mm, and 11 knots. Each section is arranged with dark brown spots on the back of the body and the chest shield is yellow-brown. Yellow, naked, 6 mm long.
Second, the damage to the symptoms of crop corn, damage symptoms: from the end of May to early June corn borer began in the surface near the ground 2-3 cm root base or junction into the junction. The boring hole has a nearly circular or elongated rift and is brown. The harmful pathogens in the soil can easily infect plants from the pod borehole. The middle and upper leaves gradually appeared yellow-green stripes, and the damage to the growing points caused dwarfing of the plants, and the leaves were clustered with clivia. The symptoms of yellow-green stripe began to appear in 8–10 days after the damage of corn borers, and the duration of the yellow-green stripes and the degree of dwarfing of the plants were closely related to the age of the leaves. In the 6-8 leaf stage of the maize, the damage was heavy. In severe cases, individual leaves faltered or appeared rows of holes, and the heart was wilted. The field symptoms of corn borer plants are similar to maize virus disease and zinc deficiency. The main difference is that brown boring or cracks are left on the roots of corn after the damage by the rotets. When the plants show obvious symptoms, the pests have been transformed and the insects are hard to find.
Third, the incidence characteristics of corn borer in the north of the year l generation, with eggs in the corn soil winter. From May to early June, the wintering eggs hatch one after another, and the larvae feed on the corn seedlings. Many seedlings can be transferred and infested in the maize seedling stage. After the seedlings reach a length of nearly 30 cm, they are rarely replanted and the larvae damage period is approximately one and a half months. In the middle and late July, after the larvae are matured, earthworms are released on the surface and the adults are bred in about 10 days. Adults are active during the day and live in the night at night. Once they have a false animation, the adults produce more eggs in the loose corn field. Each female can lay 1Q granules and more than 20-30 granules.
Fourth, the prevention and control methods (a) agricultural control law to carry out a reasonable rotation to avoid planting crops in order to reduce hazards.
(II) Chemical Control
1. Use 25% Carbaryl (Carbaryl) WP per acre, or 2.5% of trichlorfon powder, 1 to 1.5 kg, mix 20 kg of fine soil, and mix well until the early stage of larval damage ( Maize seedling stage) Shun pests spread around the corn, killing and harming pests.
2, with 90% crystal trichlorfon 1000 times, or with 80% dichlorvos EC 1500 times spray, spraying liquid per acre 60 to 75 kg. Common agents: Carbaryl, trichlorfon, and dichlorvos EC.
Disposable Nonwoven 3Ply Face Mask
Child Disposable Facemask,,Civilian Protection Personal Health Face Mask,Disposable Nonwoven 3Ply Face Mask
Dongguan Keyutai Mask Co., Ltd. , https://www.maskkytai.com