Some fans want to understand the pest control technology of sweet potatoes, and today the small editor of sweet potato hair network has specially sorted it out and shared it for everyone. The main sweet potato insect pests are: sweet potato moth, curly leaf borer, leaf beetle, small elephant beetle, stem borer, golden needle worm, scarab beetle, caddisflies, ground tiger, twill nocturnal moth and so on.
Sweet potato pest control
Common pest control techniques for sweet potatoes
When controlling underground pests (caddisflies, grubs, golden needle worms, ground tigers) control measures for underground pests, 1,000 times liquid irrigation with 50% octylthion emulsion can be used, or 100 kg of fine soil mixed with 50% octyl thiophosphate 1,000 ml per 667 square meters, and evenly sprinkled into the bottom ditch when ploughing the ground. When controlling tigers and moths, you can also use poisonous bait to trap: take 80% of the wettable powder of the enemy hundred insects 60 to 100 grams, first add a small amount of water, and then mix well with the stir-fried cotton cake or vegetable cake 5 to 7 kilograms, and then put it into the field; or use poisonous grass to trap: take 25 to 40 kilograms of fresh grass (the section of the 1.7 cm growth), then take 90% of the enemy insects 50 grams (add the appropriate amount of water and mix well), spray the liquid into the fresh grass, and sprinkle it on the root ground of the potato seedlings in the evening to trap.
1. Harmful symptoms and prevention measures of cotton red spider: adults, larvae and nymphs of cotton red spider will bite tissue on the leaves, suck sap, and appear small white spots in the victim, and then turn red, dry and fall off.
(1) Agricultural prevention and control measures. Weeds should be eradicated from field mounds, roadsides and fields, and winter ploughing and winter irrigation should be carried out in potato areas to eliminate insect sources. Pay attention to crop rotation and avoid intercropping sweet potatoes with cotton red spiders. Natural predators such as carnivorous grasshoppers, carnivorous thrips, small flower bugs, big-eyed cicadas, and ladybugs can be used for control.
(2) Pharmaceutical prevention and control measures. At the beginning of the occurrence, 5% nissolon (thiamethoxone) 1 000 times liquid, 20% mecythrin (antithalis) 2 000 to 3 000 times liquid (combined treatment of twill moth) or 0.9% avermectin emulsion 4 000 to 6 000 times liquid can be sprayed on the back of the leaf, sprayed once every 7 days, sprayed 3 times, pay attention to alternate medication.
2. Symptoms and prevention measures of the harm of the sweet potato wheat moth (leaf curl moth): the larvae of the sweet potato wheat moth spit silk curl leaves on the back of the sweet potato leaves, eat part of the leaf flesh and then move to other places to re-endanger.
(1) Agricultural prevention and control measures. Clean the countryside after harvest and eliminate the overwintering pupae. In the peak of the larval stage, timely manually kill the new leaf curl larvae, or remove the insect pest leaf curl, and kill it intensively.
(2) Pharmaceutical prevention and control measures. At the beginning of the occurrence, it is possible to spray alternately with 90% dichlorvos 1,000 times liquid, 40% Lego emulsion 1,000 times liquid or 50% octylthion 1,000 times liquid.
3. Harmful symptoms and prevention measures of sweet potato moth, twill moth and sweet potato leafminer moth: Sweet potato moth is larger than twill moth, and both use larvae to bite leaves, petioles and young stems. Sweet potato leafminer moths burrow into the leaves to feed on the flesh of the leaves, and curved tunnels appear on the surface of the affected leaves.
(1) Agricultural prevention and control measures. When controlling sweet potato moths, it is necessary to combine winter ploughing to pick and remove pupae, and use physical methods to trap adult insects. When controlling twill moths, the host egg can be removed during the adult bloom period and the adult can be physically trapped to kill the adult. When controlling sweet potato leafminer moths, it is necessary to pay attention to timely drainage of ditches and reduce the humidity in the field.
(2) Pharmaceutical prevention and control measures. At the beginning of the occurrence, 90% dimethoate 1,000 times liquid, 50% octylthion 1,000 times liquid, 2.5% cypermethrin (enemy killing) 2,000 times liquid or 10% cypermethrin (permethrin) 2,000 times liquid spray control can be used, and attention should be paid to alternate medication.
4. Hazard symptoms and prevention measures of sweet potato ant elephants: Sweet potato ant elephants will not only endanger during the growth period of sweet potatoes, but also continue to harm during the storage period, and have been listed as domestic plant quarantine objects. When eaten by sweet potato ant elephants, potato cubes form many wounds and pores, causing bacterial infections, causing decay and emitting a foul odor. Sweet potato ant elephant adults feed on stems and leaves, often making potato seedlings yellow or even dead.
(1) Agricultural prevention and control measures. After the sweet potato harvest, the disease residues of the plants in the field are cleaned up as soon as possible and the treatment is concentrated. During the expansion period of potato blocks, cover the sand caulks and cultivate the soil in time to prevent the exposed potato blocks from being bitten by insects. Implement water and drought rotation to reduce the source of insects. Strict quarantine to prevent human transmission.
(2) Biological control. After the potato field is moistened, 1.5 kg of white zombie 208 powder (5 billion / g) is used per 667 square meters, and the insect control effect is good.
(3) Pharmaceutical prevention and control measures. Soak the potato seedlings with 90% crystalline dichlorvos 800 to 1 000 times liquid, remove them and dry them before planting. In early winter or early spring, soak the small fresh potatoes or fresh potato chips and fresh stems with 90% crystalline insect 500 times liquid for 12 to 24 hours, take it out and dry it to make poisonous bait, and then dig 50 to 60 small shallow pits every 667 square meters of field, put the bait into the rear cover grass, and change the poisonous bait every 5 to 7 days. Male adult insects can also be booby-trapped with sweet potato weevil sex attractants, and the effect is excellent.
Sweet potato ant elephant trapper production and use method: use a large Coca-Cola plastic bottle to make a trap, the bottle cap with an iron wire to thread, the size of a 3 cm long, toothpick size of the core fixed on the bottle cap; when the potato block is just formed, the trap is placed in the field, put 2 every 667 square meters, and then the trap of adult sweet potato ant elephants can be concentrated to kill.
The prevention of sweet potato pests mainly grasps two periods, one is the period of sweet potato growth and development, and the other is the period of rapid expansion of sweet potatoes.
During the growth and development of sweet potatoes, spray 1000 times lesben aqueous solution on the foliage every 10-15 days, spray all the leaves evenly, so that it is advisable to start the flow of water droplets along the stems and leaves to the roots, spraying 3-5 times continuously. Les Ben is a highly permeable insecticide that travels through vines to the underground, killing underground pests and protecting underground potato blocks.
During the period of rapid expansion of sweet potatoes, every 7-10 days, the roots are drizzled with 40-50 times aqueous solution of tea bran, 2-3 times continuously, each time pouring 10-15 kg per square meter. Tea bran liquid can kill underground pests, and can timely supplement high-quality organic fertilizer, promote potato block expansion, increase starch accumulation, significantly increase yield and improve quality.
At this point, the pest control technology of sweet potato planting is shared for everyone! Xiaobian suggested that in order to seize the high quality and high yield of sweet potatoes, comprehensive measures should be taken to deal with a variety of insect pests to effectively control their harm. Learn about the potato industry information, sweet potato planting technology, sweet potato storage technology, sweet potato eating method to the sweet potato hair network!