Most pear orchards miss the control time of the peak period of overwintering adult stungs, and when the flowers fall 70% to 80%, the fruit farmers cannot see the newly hatching nymphs of pear lice, and most of them do not take medicine to control it. When a large number of nymphs are found 7 to 10 days after the flowering, spray control is started, and at this time, the nymphs have excreted mucus, and the spray control effect is extremely poor, resulting in a large occurrence of pear lice.
In the spring, pear lice concentrates on the damage at the petiole of the new shoot, and the insect state is uniform; in the summer, it is more likely to live on the back of the leaf to feed generations overlapping, secreting mucus, affecting the efficacy, the leaf damage light and efficiency are reduced, causing early leaf fall; the fruit is moldy, not large, coupled with its rapid reproduction and super drug resistance characteristics give fruit farmers headaches. We have explored a set of very ideal prevention and control methods, put forward the idea of "pressing both ends, grasping the middle", and popularized and tried in production, and achieved remarkable results.
First, press both ends, highlight the "early"
1. After fruit picking, the medicine kills the feathered adult insects. At this time, more habitats such as bud scales reduce the overwintering base and reduce the pressure in the coming year. The agent can be controlled by dichlorvos + pyridyl ether + pyrethroid insecticide mixture spray.
2. Use drugs before buds to see the weather, which reduces the insect population significantly throughout the year. Adult stings are affected by temperature, and from mid-February to mid-March, it is sunny for 2 to 3 days (above 15 degrees). Adults are active in their search for a mate and begin to lay eggs. The peak period of wintering adults is also the peak of the first generation of eggs. The agent can be controlled by organophosphorus + pyridoxine mixture spray, and it is prolonged by cold air.
3. In the first generation of feathering, there is no secretion, and the leaves have not yet grown, which is convenient for medication. The agent can be controlled by spray spray of nicotine (imidacloprid, pyridin ether) + avispirone ethyl ester, furofurane ethyl ester mixture.
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Second, grasp the middle, highlight the "excellent"
In the middle and late of May, the generation overlap is serious, various insect states appear in the field, the insect body lurks in the dark place or in the curly leaves of the mosquitoes and aphids, and a large amount of pale yellow secretion is often adhered to the two leaves and hidden in the internal hazard, and the ant activity on the tree is frequent at this time. It is difficult to use a single agent to work, and it is better to select excellent agents to mix, and if necessary, spray agricultural water quality optimizers;
Pear lice large occurrence special tips:
1 . With the right medicine,
2 . Use enough water,
3 . Spray carefully,
4 . It is strictly forbidden to spray the remaining medicine twice, and the second re-spray must be a drug hazard.
5 . Pay attention to the high temperature during the application period, it is strictly forbidden to use high temperature medication (> 32 °C with caution, and it is forbidden to use it all day above 34 °C), be careful of drug damage!
Medication preparation:
(1) Lice combination (matrine + avermectin) or Zhongda solo diamond (avermectin + additive)
(2) Simnet (matrine) + demystifer (avermectin)
(3) Pecking lice (avigal chloride) + green companion (plant surfactant)
(4) Qianxiang (imidacloprid chlorpyrifos) + positive and negative (avermectin),
Choose one! Alternate rotation! In addition, the adult pear lice have a strong ability to migrate and fly, and joint prevention and treatment should be carried out.
Hui Shengyuan (huì shèng yuán) interpretation
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The original meaning of the Yuan, the fundamental, the origin of all things;
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