   The flowering stage of spring shoots is the main pest and worm occurrence period of citrus, and it is also the most important and effective period for preventing and controlling citrus pests and diseases. It can play the role of pre-pressure control and twice the result with half the effort. At present, the citrus spring shoots have begun to be extracted, which is the key opportunity for the prevention of citrus pests and diseases. Fruit farmers should pay great attention to it and prevent it in time.
   The specific pest control techniques are as follows:
   Citrus scab: mainly affecting new shoots and young fruits, and can also damage flower buds and petals, or cause defoliation, falling flowers, fruit drop or abnormal leaves, and abnormal fruit, affecting yield and quality. On the basis of adopting the winter clearing garden and strengthening the management of the orchard, we will focus on the three key periods of drug protection: the first time when the spring buds grow to 1~2 mm, the second time when the flowers fall by two-thirds The third time when the young fruit is large. The medicament can be sprayed with 0.6%~0.8% equivalent Bordeaux mixture, 20% thiabendazole 500~700 times, 20% Daisen water dispersion granule 500~700 times.
   Citrus hibiscus: Citrus hibiscus is a toxic medium for the devastating disease of citrus Huanglongbing. It is clustered to absorb new shoots, young leaves and young shoots. It is mainly caused by the spring, summer and autumn shoots during the year. When spraying must be spring shoots sprout from 2 to 5 mm to 1 times, every 7 to 10 days and then once a spraying, prevention fleas completely. You can use 40% profenofos EC, 1000 times, 40% chlorpyrifos 800 times, 22 % cyanoquinone oxalate 1000 times, etc.
   Citrus anthracnose: mainly damages leaves, shoots, fruits and large branches, trunks, flowers and fruit stalks, leading to leaf blight, leaf blight, fruit rot and fruit drop. Combined with spring pruning diseased branches cleared basis, the fruit of the disease, the key to a good job of prevention: to protect the foliage in the spring, summer, autumn shoots of young shoots of each spraying once, to protect the young fruit within 1 month after falling once every 15 days, 2 to 3 times. 80% mancozeb wettable powder 400~600 times, 50% carbendazim wettable powder 600 times can be used for spraying prevention.
   Citrus red spider: An important pest of citrus. It is caused by the formation, if, and the young clam cluster leaves and fruit juice, causing the leaves to fall. Red spiders occur in multiple generations a year, and the generations overlap. Recently, the red spider eggs began to hatch. When the citrus has 6 insects per leaf, it should be sprayed and controlled, which can effectively control the annual red spider body base. It can be sprayed with 99% mineral oil emulsifiable concentrate 200~250 times, 2.0% avermectin emulsifiable concentrate 1000~1500 times, 57% acetylene emulsifiable concentrate 1500~2000 times.
Citrus sylvestris (orange stalk): It takes the adults to feed the young leaves of the young leaves, and the larvae eat the mesophyll, causing the leaves to be nicked, curled and sallow. The insect occurs one generation a year , and the spring shoot period is the peak period of the insect, which is also the main period of prevention and control. The drug control is controlled in two key periods: First, it is controlled during the period of unearthing activity of the insect overwintering adults. It can be sprayed with 40% chlorpyrifos EC 1000 times, 80% dichlorvos EC 800, etc., and combined with ground spraying 40%. phoxim 400 ~ 600 times and other control; two young nymphs rests in early April of the peak, the choice of 25% phosmet emulsion 800 times, 1000 times chlorpyrifos 48%, 1.8% avermectin EC 3000 Double-spray spray control, even after 5 to 7 days of continuous spraying 2~3 times.
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