Recently, a user in Fuzhou City asked a question in the agricultural housekeeper: Found this insect, is it useful to spray with cypermethrin plus chlorpyrifos?
Agricultural housekeeper experts answered
Liu Fenghua (Member of China Cotton Association, 4th Golden Straw Hat Expert)
Spray kung fu, bifeneryl triadine control Can not use chlorpyrifos banned drugs
Zhang Jing (good at plant protection technology)
Green phosphorus weevil, chlorpyrifos is better to replace tick with thiamethoxam
Lv Lanhua (Agricultural Bureau of Yanggu County, Shandong Province)
Weevil sprays can be mixed.
Feng Tao (Lu'an City, Anhui Province, Agricultural Technology Station)
Weevil hazards It is recommended to use bifenum + alenopterazine or thiamethoxam spray control
Xia Yingsan (Agricultural Technology Station, Qingyun Town, Linshu County, Shandong Province)
Green scaled weevil, controlled with cypermethrin and acetamiprid spray. Can't and chlorpyrifos, has been disabled.
Lu Pengyuan (Southwest Forestry University, Zhengzhou City, Henan Province, specializing in plant protection technology)
Can be used efficiently
Hong Haidi (Chenggong District, Kunming, Yunnan)
Available, highly potent cypermethrin, methylaminoavermectin benzoate, bifenthrin, thiamethoxam, bifenthrin
Farmer Butler Classroom - Mango Cut Leaf Elephant
Habitual symptoms
First, life habits. After the mango cut leaf elephant adult feathering is unearthed, it has obvious upward, tender and cluster nature, and often concentrates on the young shoots and young leaves of mango. There is a certain phototropism. In case of alarm, suspended animation landed on the ground or flew away halfway. Adults lay eggs on both sides of the midrib of young leaves, each female lays 220 to 495 eggs, and the number of eggs per leaf is 1 to 23, an average of 4.3, and the eggs are cut by adults at 1/4 to 1/3 of the leaf base and land on the ground. The eggs hatch in the deciduous leaves, and the larvae dive into the deciduous leaves to feed on the leaf flesh. After the larvae mature, they break their leaves into the soil and make pupae in the soil chamber. The occurrence of mango cut-out elephants is closely related to the suitability of climatic and soil conditions. In addition to affecting the development period of each insect, the temperature also affects the feeding and survival of the insect, when the temperature is lower than 20 °C, the adult insect feeding amount is significantly reduced, and when it is below 10 °C, it stops eating.
Second, the characteristics of harm. Adults feed on the upper epidermis and mesophyll of new shoots and young leaves, causing the leaves to dry out. Female adults lay eggs on young leaves and bite off from near the base of the leaf, with incisions as neat as a knife cut. If the damage is severe, almost the entire young leaves are cut off, and the normal growth of the young tree is affected when the damage is severe.
3. Host mango, longan, lychee, cashew nut, peach.
Regularity of occurrence
1. 7 generations can occur in 1 year in Nanning City, Guangxi Province, 9 generations occur in Danxian County, Hainan Province, and 3 to 4 generations occur in Xishuangbanna, Yunnan Province, with overlapping generations. The old mature larvae of the insect overwinter in the soil, and in March of the following year, the overwintering adults are seen feathering, which is a sporadic shoot of mango.
2. Distributed in Guangxi, Guangdong, Hainan, Yunnan and Taiwan.
Prevention and control methods
Agricultural control
First, the new orchard to be opened should avoid mixing mango and longan to eliminate or reduce the source of insects.
Second, for orchards mixed with mango and longan, weeding, fertilization or control of winter shoots can be combined to turn over the soil of the garden to kill some of the pupae and overwintering larvae in the soil.
Third, for mango and longan mixed orchards, in this weevil occurrence period, it is necessary to collect the young leaves of the mango that have been bitten off and fall to the ground in time, eliminate the insect eggs, and reduce the insect population of the next generation. From the beginning of the second physiological fruit drop of mango to the harvest period, it is often necessary to pay attention to picking up the ground and burning the abandoned fruit cores.
Fourth, strictly implement the quarantine system and strictly prevent the spread of pests with fruits, cores or seedlings outside the epidemic area. Once the new area is discovered, it must be extinguished in time.
Pharmaceutical control
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