Dragon fruit scale continuous planting, disease and pest situation is more complex and changeable, how to do a good job of plant protection work scientifically and safely, safe use of drugs, need more experience accumulation.
This is not the recent Miss Jiang user from Guangzhou City sent a picture of the dragon fruit problem on the agricultural housekeeper platform, asking whether the flower skin on the dragon fruit was caused by insect pests?
Image from: Farmer Steward user
The expert of the farmer housekeeper gave the answer according to the picture display:
Feng Tao (Lu'an City, Anhui Province, Agricultural Technology Station)
Pests of leaf a nail are recommended for control by bifenerate + alenoperidine or thiamethoxine spraying.
Lv Lanhua (Yanggu County, Liaocheng City, Shandong Province, good at plant protection technology)
For the harm of leaf acetodes, it is recommended to use alenopfen + bifenerate, thiamethoxine + high-efficiency cypermethrin, ethyl spiranterium and other spray control.
Xinhua Guo (Liaocheng City, Shandong Province, Agronomist, Technical Station Manager)
Foliar nails can be controlled with bifenthrin plus acetamiprid, or highly effective cypermethrin plus pyridazine, cypermethrin plus imidacloprid plus pyridine.
Liu Xuelian (Wuji County, Shijiazhuang City, Hebei Province, good at plant protection technology)
Foliar aeronautical hazards can be used with bifenthiazide.
Lu Pengyuan (Southwest Forestry University, Zhengzhou City, Henan Province, specializing in plant protection technology)
Leaf achillesic pests, considering high-efficiency cypermethrin, perchlorothiazide, bifenthrin, bifenthrin thiazide, bifenthrin thiosethiacillamine, can be used.
<h1>Agricultural steward knowledge expansion - dragon fruit leaf beetle</h1>
First, life habits
(1) Adult insects: with suspended death, after being frightened, suspended to land on the ground, their hindwings degenerate, no ability to fly. It is slightly clustered, can be eaten day and night, and often mixes with the great ape leaf carapace. The eggs are scattered at the base of the leaf, mostly on the petiole, and the prenatal bite hole, one hole and one egg, are placed horizontally. The egg stage is about 7 days. Adults have a long lifespan, averaging about 2 years.
(2) Larvae: prefer to feed on the heart leaves, and are active day and night, especially at night. It has a suspended death, and after being frightened, it shrinks to the ground. The old mature larvae enter the soil for about 3 cm to build an earthen chamber to pupate, and the pupal stage is 7 to 11 days.
Second, the characteristics of harm
Adults and larvae feed on the leaves, form missing notches or holes, and form a severe network of veins, leaving only leaf veins.
Third, it is harmful to crops
Rape, cabbage, turnips, etc.
Fourth, the law of occurrence
Generations: 3 generations occur in the Yangtze River Basin and 5 generations in Guangdong.
Overwintering: Adults overwinter in the Yangtze River Basin under dead leaves or root gaps, and there is no obvious overwintering phenomenon in Guangdong.
Period: In April, the mixture of adults and larvae is the most intense, and in mid-May, the temperature gradually rises, and the adults lie dormant for more summer. Activities begin again in late August, with eggs laid in early September and adults overwintering in mid-to-late December.
Fifth, prevention and control methods
Clean the countryside in time after harvest and eliminate adult wintering and summering insects. Combined with autumn and winter fertilizer, the removal of dead leaves from vegetable fields and the eradication of weeds can eliminate some of the sources of overwintering insects and reduce the feeding of pests in early spring. Second, before the adult insects overwinter, they pile vegetable leaves and weeds in the fields, mounds and furrows to lure the adult insects and kill them in a concentrated manner.
Medication regimen
2.5% cypermethrin microemulsion (moderately toxic) use 20-40 ml/mu spray
40% Chlorpyrifos Micro Emulsion (Moderate Toxicity) use 1500-2000 times liquid spray
300 g/L Chlorpyrrexate thiamethoxine suspension (microtoxic) use 27.8-33.3 ml/mu spray or irrigation
40% carbonitrile. Pyridoxine suspension (moderately toxic) use 24-30 ml / mu spray
20% acetidium pyridine microemulsion (moderately toxic) use 20-25 ml/mu spray
15% pyridine microemulsion (moderately toxic) use 75-100 g/mu spray
25% thiamethoxine water dispersible granules (low toxicity) use 10-15 g/mu spray
45% malathion emulsion (low toxicity) use 80-110 ml/mu spray
20% cyanogen dichlorvos Emulsion (low toxicity) use 50-75 g/mu spray
20% per chlorine equisa emulsion (low toxicity) use 60-86.6 ml/mu spray