Cotton cotton field tiger

The ground tigers that injure cotton mainly include small tigers and yellow tigers.

The scientific name, host, and morphological characteristics can be found in underground pests such as ground tigers and yellow tigers.

One of the characteristics of damage is that young shoots are eaten by the larvae in the soil, the cottonseed is eaten short, resulting in lack of seedlings and ridges; the second is the damage to the cotyledon, the cotyledon is bitten into many holes or nicks; the third is the point of growth of cotton seedlings is cut off, forming Long cotton, flowering bells less and late. Fourth, the base of the cotton seedlings was snapped off, and the shoots and leaves of the broken seedlings were dragged to the soil in the larvae, resulting in the lack of seedlings and ridges.

Habits of life 3-4 generations, mainly small tigers and yellow tigers, a generation of larvae damage cotton seedlings. Small ground tigers occur earlier. The hatching period of a generation of eggs begins in mid-April, and in late April and mid-May, it enters the larval stage. Yellow earthworms occur slightly later, entering the hatching period of a generation of eggs in mid-May, and entering the period of larval infestation from late May to mid-June.

Control methods (1) Implementation of rice-cotton rotation. (2) Before and after sowing, the weeds in and outside the fields are cleared. The heavy-weighted fields can be combined with irrigation to infuse some larvae. (3) Chemicals seed dressing with 1kg75% formazan EC for water 25-50kg, mixed with 10kg dry seedlings to control seedling tigers, while also treating seedlings Thrips. (4) In the emergence period, 10% of the newly-damaged strains before the seedlings and 5% of the newly-damaged strains after the seedlings are sprayed with 2.5% deltamethrin emulsifiable concentrate 2000 times or 50% methamidophos EC 1500 times. (5) To poison bait, use 90% crystals of trichlorfon 1kg to add 5 to 10 liters of water, spray on 10okg of crushed cottonseed cake or oil dregs and mix well. In the evening, sprinkle poison baits around the cotton seedlings, and use 10 for every 667m2. 20kg to kill the larvae.