Main Pests of Overwintering Cabbage and Their Control Methods
1. Nutrient Solution Formula The nutrient solution formula for kale in the Beijing area is the same as that for hydroponic lettuce, so it will not be repeated here. 2. Nutrient Solution Concentration Management Kale has a strong ability to absorb nutrients and requires sufficient fertilizer. The nutrient solution concentration management index is 2.5-3.0 ms/cm, and this concentration can be used consistently from planting to harvest. 3...
Diamondback Moth Physical control: Diamondback moth is phototactic. During the adult occurrence period, setting up one black light lamp every 10 mu can trap and kill large numbers of diamondback moths. Biological control: Bacterial insecticides such as Bt can cause large numbers of diamondback moths to become infected and die. Chemical control: Currently available agents and concentrations include 25% or 30% diflubenzuron No. 1 or No. 3 at 500-1000 times dilution, 50% diazinon emulsifiable concentrate at 1500 times dilution, 5% chlorfluazuron emulsifiable concentrate at 2000 times dilution, and 5% flufenoxuron emulsifiable concentrate at 2000 times dilution. Spray control should be carried out at the early stage of occurrence, and the spray should reach the underside of leaves or new leaves, spraying once every 5-7 days for 3-5 consecutive applications.Beet Armyworm Physical control: Adults have strong phototaxis and can be trapped and killed by setting up frequency-vibration insect-killing lamps in the field. Chemical control: Optional agents include 15% indoxacarb suspension concentrate at 2000-3000 times dilution. Control should be timed during the peak hatching period of larvae and the peak period of first-instar larvae. Spraying should be uniform and thorough, with sufficient coverage on both sides of plant leaves. This pest has strong pesticide resistance, so attention should be paid to rotating pesticides. Beet armyworm is omnivorous and voracious, so spraying should be uniform and thorough, focusing on the undersides of leaves and the heart leaves. Beet armyworm has the habit of hiding by day and emerging at night, so control should be carried out in the evening. During hot and dry seasons, the water volume for controlling beet armyworm should be increased.
Tobacco Cutworm Physical control: Frequency-vibration insect-killing lamps, sex pheromones, black light lamps, or sugar-vinegar traps can be used to trap and kill adults. Chemical control: Spraying should be carried out in the evening. Optional agents include 5% fipronil at 1500-2000 times dilution, 10% chlorfenapyr suspension concentrate at 1000-1500 times dilution, 15% indoxacarb suspension concentrate at 5000 times dilution, and 5% flufenoxuron at 1000-1500 times dilution for spray control.
Cabbage Caterpillar Biological control: Bacterial insecticides such as Bt and Qingchongjun No. 6 liquid preparation can be used, usually at 500-800 times dilution. Chemical control: 2.5% beta-cypermethrin emulsifiable concentrate at 2000 times dilution, 5% fipronil suspension concentrate at 2500 times dilution, etc. can be used for control. 20% or 25% diflubenzuron No. 1 or No. 3 colloidal suspension at 500-1000 times dilution can also be used for control. However, the effect of such agents is relatively slow, usually only killing the pests when the larval instar changes, so spraying should be done early.