Control of common diseases and insect pests in growing citrus

Citrus bud maggots can be controlled when the buds are white (about the size of mung beans). The method is to spray the ground with 90% crystal trichlorfon 120g-150g plus water 20kg per mu, or 1605 capsules 150g or 3% carbofuran 2.5kg-3kg per mu, add 25 kg fine soil, mix well and sprinkle on the soil surface in the tree crown drip line. If you miss the opportunity of spraying on the ground, you can also spray 1000 times of dichlorvos EC on the canopy in the morning or evening during adult Eclosion.

Citrus aphids can be sprayed when 25% of the new shoots in the field are damaged by aphids. The medicaments are: 20% imidacloprid wettable powder 2000-3000 times liquid, 20% good year winter (Haoanwei) EC 2000-3000 times, 10% nicotine EC 500800 times, 80% dichlorvos EC 1000-2000 times, etc.

Citrus red spiders can be sprayed when there are 3-4 mites per leaf. The medicaments are as follows: 4000-5000 times of 20% acaric wettable powder, 1500-2500 times of 50% bromoacaron EC, 2500-3000 times of 50% nisoron EC, 3000 times of 50% Tolk wettable powder, 1500 times of amitraz EC, 1000-1500 times of miramycin EC, 1, 000-2, 000 times of 5% paraben suspension, 0. 3-0. 5 pomethyl sulphur mixture, etc.

Before going up the tree, the adults of citrus weevil bandage the trunk with glue ring (castor oil: rosin: yellow wax = 40:60:2), or apply glue directly on the trunk to prevent the adults from getting into the tree. In addition, spray control can be used in the adult emergence period. The medicaments include: 1000 times of 80% dichlorvos EC, 200 times of 50% phoxim EC, 800 times of 50% fenitrothion EC, 1000 times of 25% imidathion EC or 40% dimethoate EC.

Snails are artificially hunted and killed when snails are damaged in cloudy and rainy days. Raising chickens and ducks to feed in the orange orchard; ploughing and loosening the soil during the peak spawning period of snails to expose insect eggs; spreading lime powder and plant ash on the soil around the trunk of the plant at night; using 1 part of calcium arsenate and 30 parts of wheat bran to make poison bait and putting it in the orange orchard. Mix well with 300g polyacetaldehyde, 50g sucrose, 300g calcium arsenate and 400g rice bran (fried incense), add appropriate amount of water to make soybean-sized granules, and mix well with soil in the proportion of 1:10-15 and sprinkle in the evening.

Control when 20% of the leaves on the spring shoot of citrus planthopper are damaged by nymphs. The medicaments are: 20% imidacloprid wettable powder 2000-3000 times liquid, 20% good year winter (Haoanwei) EC 2000-3000 minutes 3% acetamiprid EC 1500-2000 times, 40.7% chlorpyrifos EC 1200 times, 80% dichlorvos EC 1500-5000 times, and so on.

Citrus skirt rot can be treated in time, and disease-resistant rootstocks can be used to restore tree potential for young diseased trees. The decaying bark and discolored xylem tissue of the adult diseased tree can be scraped off and protected by applying medicine to the wound. The agents include 1:1:10 Bordeaux pulp, 2-3% cupric sulfate solution, 20-300 times of bezoar wettable powder, and 100-200 times of thiophanate methyl (or 50% carbendazim) wettable powder.

Stem blight and anthracnose of seedlings were removed and protected by spraying. The medicaments include 0.5% lime equivalent Bordeaux solution, 70% methyl thiophanate (or 50% carbendazim) wettable powder 800-1000 times, 77% killing wettable powder 500,600 times, and so on.

Strengthen the inspection of citrus resin disease and cut off the diseased branches.