The main hosts of the country are Oystercatcher and its variants, such as dragon's claw and butterfly, which are mostly planted in densely populated residential areas or parks. Prevention and control with chemical pesticides can easily cause environmental pollution and pests are susceptible to drug resistance. According to the morphological characteristics and occurrence regularity of S. obtusifolia, a special prevention and control method can be used to achieve better pest control effect under the premise of minimizing environmental pollution.
1. Morphological characteristics: Adult worms are yellowish-brown in colour, antennae are filiform, and there are three dark brown wavy stripes on the front and rear wings. Eggs are oblate and have a reticulate surface and pale green when they are first born. Two types of larvae, spring type mature body length 38 to 42 mm, body light green, dense black dots above the valve line, dark green below the valve line; autumn type mature 45 to 55 mm in length, body pink green with blue Each section has a black cross in the center. Cone type, green powder, brown.
2. The law of occurrence: Henan region takes 3 to 4 generations a year, and it is wintering in the earth. Adults emerged in late March. Eggs were produced on the front of the leaves and formed into flakes with more than 10 grains per piece. From late April to late September, there are larvae that attack the leaves of the larvae. After being frightened, drooping drooping occurs. After late September, the larvae enter the soil for winter.
3. Control methods: First, apply a layer of plastic film on the ground under the canopy (the hard surface is not laid), then use a high-pressure sprinkler gun to spray the water on the tree crown, so that the insects will quickly fall or fall after being frightened. In the plastic film, they are then collected and killed; at the same time, they are tied in a plastic film with a width of 5 to 7 cm in the tree base to prevent individual larvae or wingless moths from getting on the tree, so that no control measures can be taken without pesticides. Poison, and can effectively protect and use natural enemies.
1. Morphological characteristics: Adult worms are yellowish-brown in colour, antennae are filiform, and there are three dark brown wavy stripes on the front and rear wings. Eggs are oblate and have a reticulate surface and pale green when they are first born. Two types of larvae, spring type mature body length 38 to 42 mm, body light green, dense black dots above the valve line, dark green below the valve line; autumn type mature 45 to 55 mm in length, body pink green with blue Each section has a black cross in the center. Cone type, green powder, brown.
2. The law of occurrence: Henan region takes 3 to 4 generations a year, and it is wintering in the earth. Adults emerged in late March. Eggs were produced on the front of the leaves and formed into flakes with more than 10 grains per piece. From late April to late September, there are larvae that attack the leaves of the larvae. After being frightened, drooping drooping occurs. After late September, the larvae enter the soil for winter.
3. Control methods: First, apply a layer of plastic film on the ground under the canopy (the hard surface is not laid), then use a high-pressure sprinkler gun to spray the water on the tree crown, so that the insects will quickly fall or fall after being frightened. In the plastic film, they are then collected and killed; at the same time, they are tied in a plastic film with a width of 5 to 7 cm in the tree base to prevent individual larvae or wingless moths from getting on the tree, so that no control measures can be taken without pesticides. Poison, and can effectively protect and use natural enemies.
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