In a recent survey conducted among technicians in Hebei Pixian County, it was found that the ground tiger has severely impacted spring corn fields, prompting farmers to take necessary precautions. The ground tiger is particularly harmful during its larval stage, and the damage caused by larvae of different ages varies significantly.
First and second instar larvae are known to stay up late and feed on heart leaves or young leaves. By the third day, these larvae tend to hide in the soil during the day and become active at night, feeding on the stems of young seedlings and causing them to die. Fourth instar larvae are even more damaging and possess stronger resistance to pesticides. Therefore, it's crucial to eliminate the larvae before they reach the third instar stage.
To effectively manage ground tigers, a combination of control methods should be employed, including trapping adult insects, weeding, chemical treatment, and manual removal. Trapping adult tigers using black lights or sweet and sour liquid solutions can significantly reduce the number of first-generation larvae. Removing weeds from the field, ground, and pathways helps eliminate their breeding grounds, as well as some eggs and larvae.
Spraying insecticides in the evening is an effective method. Solutions such as 2.5% deltamethrin EC diluted 2000 times, 4.5% Longbao beta-cypermethrin EC diluted 3500–4000 times, or 50% phoxim EC diluted 1000 times (with strict dosage control) can be used. Toxic soil treatments, mixing 50% phoxim with fine soil or combining 20% mevinphos permethrin EC with sand, are also effective for applying in the field.
Bait traps are especially useful for fourth instar larvae. Using 0.5 kg of 90% trichlorfon water-soluble powder mixed with about 5 liters of water and sprayed onto chopped straw or cottonseed husks can help attract and kill the larvae. Applying approximately 4–5 kg of poisoned bait per acre in the evening is recommended.
When the insects are mature, 80% dichlorvos EC or 50% phoxim can be applied at a rate of 0.2 kg per acre mixed with 400 kg of water or coated on plant stems. Manual collection of damaged areas is also effective—when broken seedlings are found, the topsoil or wheat straw near them can be carefully opened in the morning to remove and kill the larvae.
Zhang Mingjun, Zhaoxiang Yue, Agricultural Bureau of Ganyu County, Hebei Province.
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