The nature of the damage to the main damage to tiger seedling vegetable seedlings. Newly hatched larvae often cluster on the back of the heart or leaves of the seedlings and bite the leaves into small nicks or meshes. After 3rd instar larvae bite off the stalks of the vegetable seedlings near the ground, they often drag the bitten seedlings into the hole. The upper leaves of the larvae are often exposed outside the hole, causing the whole plant to die, causing the seedlings to become ridged and destroyed. You can also drill into eggplant, pepper fruits or cabbage, cabbage leaves, which seriously affect the yield and quality of vegetables.
Control methods
1. Agricultural control In winter and spring, weeds in and around the greenhouse are removed to prevent adults from spawning inside and outside the greenhouse. For those who have already spawned and found 1 to 2 instar larvae, spraying and then weeding should be performed first to prevent the individual larvae from hiding in the soil. The weeds removed should be kept away from the vegetable fields and destroyed or composted.
2. Induction and killing prevention First, black light traps the adult. The second is to kill adults with sweet and sour liquid, that is, with 6 parts of sugar, 3 parts of vinegar, 1 part of white wine, 10 parts of water, 9 parts of trichlorfon and mix thoroughly, or add proper amount of pesticide with pickle water, set in the adult stage; Some fermented sour foods, such as sweet potatoes, carrots, rotten fruits, etc., plus appropriate amounts of pesticides, can also entice adult worms. Third, bait traps adult worms. First stir the bait (grain, wheat bran, bean cake, cottonseed cake, or corn grits) in 5kg of saute, and then mix with 90% trichlorfon 30 times 150g, and add enough water to mix the tide for each mu. Use 1.5 to 2.8 kilograms to spread the fields in the windless and sultry evening. Can also be used 40% Dimethoate EC 10 times or other insecticide mixed bait, 4 to 6 boluses per square meter. The fourth is the trapping of larvae by the grass. Before the nursery or colonization, the larvae of the tigers only feed on the weeds in the field. Therefore, the larvae can be selected for their weeds, bitter leeks, mugwort, and imperatae.
3. Manual picking treatment Early morning smashing of the topsoil near the seedlings, lurking old larvae can be caught, and the results are good for consecutive days.
4. Chemical resistance The resistance of the first to third instar larvae of the ground tiger is poor, and it is exposed on the host plant or on the ground. It is a suitable period for chemical control. Can choose to use 2.5% deltamethrin EC 3000 times solution, or 90% trichlorfon crystal 800 times solution, 50% phoxim EC 800 times solution spray control. Poisonous soil method can also be used to make arsenopyrite pesticide arsenopyrite, 50% phoxim EC 0.5 kg water mixed fine soil 50 kg, the amount of 20 kg per mu, anterograde application in the seedlings near the rhizosphere. When the worm age is large, 80% of dichlorvos emulsifiable concentrate and 50% phoxim EC can be used to irrigate the roots.
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