The ground tiger is a Lepidoptera, Noctuidae, commonly known as silkworm, cutworm. There are many types of ground tigers, among which the small tigers are the most widely distributed and occur almost all over the country, causing serious damage. Followed by the land tiger and yellow tiger.
1. Morphological characteristics: (1) Small tiger: adult body length 16-23 mm, wing length 42-54 mm, gray-brown, with a kidney-shaped pattern in the middle of the forewing, and second, there is a wedge-shaped spot on the outside and the outer edge of the wing. A wedge-shaped spot facing inwards is opposite. The female moth is filiform in shape, and the male moth is dentate; the larva is gray-brown and has two symmetrical black stripes on the back of the distal segment of the abdomen. (2) Earth tiger: adult body length 20-25 mm, wings wider than the other two, gray and black. Two-thirds of the front wings of the forewings are brown, with several brown spots, a black kidney-shaped pattern in the middle, a round black marking on the inside, and an oblong black marking connected with the kidney-shaped pattern. Larvae brown, abdomen distal section of the wireless pattern. (3) Yellow ground tiger: adult body length 15 - 18 mm, light brown gray body, grayish brown fore wing, transverse line is not obvious, the middle of the outer black kidney pattern and 2 black ring pattern. The larvae are yellow and there is an indistinct dotted line on the back of the abdomen.
2. Control methods: (1) Agricultural control: weeding and disinfestation. Reduce and eliminate eggs and larval parasites. Irrigation water. After the occurrence of the ground tiger, especially after the increase of the worm age, according to the different types of crops, timely irrigation, the ground tiger with the drill into the deep soil to reduce the damage to the crop. (2) Chemical control: application of toxic soil. Before the third instar larvae, in the crop seedling stage, mu with 2.5% trichlorfon powder or 0.5-1.0 kg of zinc powder, mixed fine soil 15-20 kg, dubbed toxic soil, sprinkled in the seedling heart. Spray liquid medicine. Before the 3rd instar of the ground tiger, in the seedling stage of corn, beet and other crops, 50% phoxim or dichlorvos EC may be used 1000 times, and then sprayed to the seedlings along the ridge. Poison bait trapping. After the worm age increases, bait trapping is performed. That is, 0.05 kg of white wine, 0.15 kg of brown sugar, 0.2 kg of balsamic vinegar, and 5 kg of dichlorvos 0.5 kg are mixed in 25 to 30 kg of fresh leaves and spread to the fields in the evening. Pouring poisonous water. When the ground tiger is found to be infested, 0.2-0.25 kilograms of 40% omethoate EC per acre is dropped into the outlet, and good results can be obtained.
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