Recently, Gannan Navel Orange and Nanfeng Honey Orange were successfully selected into China's first list of geographical indications protected by the European Union, which is gratifying and congratulatory. At present, citrus is a critical period of rapid growth and development and fruit expansion, and will enter the autumn shoot extraction period, which is the most harmful period of psyllids. In July, the orchard survey showed that the insect shoot rate was close to 5%, the number of insects was generally 10 or 20, and some orange orchards had begun to occur in large numbers. Citrus lice is the only non-human transmission vector of citrus yellow dragon disease, and citrus yellow dragon disease is a devastating citrus disease, once the disease has no effective treatment technology, can only cut down trees, the past 5 years to cut down nearly 100 million diseased plants, only Ganzhou area 2 years cut 30 million trees. Therefore, in the autumn shoot period, we should focus on the prevention and control of wood lice, especially the high-connection garden, the unmanaged garden, and the orange garden with a large amount of hair, and build a dam to prevent and control Huanglong disease.
Photo/ Qingliu Sword, Plant Protection Plant Inspection in Yihuang County
<h1 class="pgc-h-arrow-right" > first, the occurrence characteristics of citrus lice</h1>
Citrus psyllids use nymphs and adults to harm young shoots, young leaves and young shoots, causing distortion and deformity of new leaves, dry and shrinking young shoots, and white excrement of nymphs to induce soot disease.
Temperature is the main factor affecting the activity of wood lice, high temperature in summer and autumn, the number of eggs laid by wood lice, short insect age, rapid reproduction of adult insects, generation overlap; the annual growth of wood lice mouth is synchronized with the new shoots, of which the autumn shoot period is the peak of the annual wood lice pest. Under the action of typhoon rain and strong convective weather, adult wood lice can be passively migrated over a long distance, and August and September are typhoon seasons.
Nymphs older than 3 years old can transmit germs
<h1 class= "pgc-h-arrow-right" > second, prevention and control methods</h1>
1. Pharmaceutical prevention and control
(1) Pharmaceutical selection: pyriprone, thiamethoxazine, flufenoxaminonitrile, bifenthrin, high efficiency cypermethrin, high chlorine chlorpyrifos, acetyl chlorpyrifos, acetyl chlorpyrifos, pyriproma thiazide, spiranthiazine, spiroprim and other agents, when dispensing drugs, we must take into account various insect states (eggs, nymphs, adults), pay attention to the rotation of medication.
(2) Control period: Generally the first time when the autumn shoots are 0.5-1cm long, the interval is 7-10 days to control once, combined with the prevention and control of leafminer moths, scale insects, anthrax and other diseases and insect pests, continuous medication 2-3 times.
(3) Prevention and control suggestions: adopt unified prevention and control, it is recommended that the same township or the same area of centralized drug prevention and control, you can choose high-efficiency spraying machinery or orangery preset spraying facilities, when applying drugs, to ensure full coverage of trees and ground, improve the efficiency of prevention and control. Summer and autumn medication avoids high temperatures, and it is recommended to spray before 10 a.m. and after 4 p.m. After the typhoon, inspect the orchard, and if adult citrus lice are found, spray the drug in time to control it.
2. Other prevention and control measures
Use virus-free citrus seedlings. Scientific and rational fertilization, enhance tree potential, improve tree resistance. Erase the sporadic young shoots that germinate before the middle of August, uniformly release the autumn shoots, and erase the late autumn shoots that emerge after mid-September; timely remove the brassica plants such as yellow peel, nine incense, and citrus shell around the orange orchard, and reduce the feeding material and spawning points of citrus lice. When dealing with a diseased plant that has been affected by huanglongbing, it is necessary to kill the psyllids before cutting down the tree.
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