Controlling day lily pests
Yellow spider red spider Yellow spider red spider often clusters on the back of the day lily leaf. The damaged leaves showed small white spots, and red spots appeared in the proximal veins. The red spider on the leaf is grayish white, and when it is severe, the leaf is slightly curled down and rust brown, the flower bud is dry, and the plant is dead. The adult body color varies greatly, generally red and rust red, also green, black and yellow, female pear shape, body length 0.4-0.6 mm, larva body round, length about 0.15 mm, body color transparent, take After eating, the body color becomes dark green.
Yellow spider red spider can occur for about 20 generations a year. Adults, nymphs, larvae, eggs overwinter on the leaves of dead autumn leaves, in soil seams or on weeds. In the second year, they begin to move and reproduce with the unearthed yellow flowers. Red spiders breed faster in May, and the harm is intensified: the number has increased sharply from June to July, which is harmful to the cockroaches; the number of growth and reproduction with autumn seedlings has increased from October to November.
The method of prevention and treatment is sprayed with 40% dimethoate 1000 times liquid, the dosage of 75-100 kilograms per mu is sprayed once every 5-6 days, 23 times in a row, and can be sprayed with 25% of the medium-sized beauty bell 1000-1500 times liquid, and the dosage is 75-100. Kg, spray once every 5-6 days, 2-3 times in a row. It can also be sprayed with washing powder, diesel oil and emulsion 1:03:200 times. It can also be sprayed with a 1:1 mixture of 0.3-0.5 degree stone sulphur. Or use 4.5% high-efficiency cypermethrin 2000-2500 times liquid, spray the amount of 75-100 kg per mu. Spray once every 5-6 days for 2-3 consecutive times. If the above agents are used alternately, the effect is better.
Aphids Yellow locusts are wingless aphids. The body length is about 3-5 mm, the whole body is pink, the compound eyes are black and red, and the antennae are large. The eggs are as big as millet. The larvae are green, with 6 pairs of feet and 1 pair of horny tubes at the tail. They can secrete mucus to attract ants, and can be parthenogenetic. They can breed 8-10 generations in one year, and the generations overlap. The yellow locusts usually cluster on the back of the leaves in late May, and spread to the flower moss and flower buds in the middle and late June. The most serious damage occurred in July. The mites mainly absorb the sap on the flower buds, so that the buds can not be stretched out, and the dysplasia affects the yield and quality of the daylily.
Control method 40% Lego emulsifiable oil 1000 times liquid spray, the amount of 75-100 kg per mu, spray once every 5-6 days, 2-3 times. It can also be sprayed with 5% high-efficiency fish cyanide 3000 times liquid. The dosage of 75-100 kilograms per mu is sprayed once every 5-6 days for 2-3 times. It can also be sprayed with 25% Zhongmei Bell from 1000-1500 times, and the amount of mu is 75-100 kg. It is sprayed once every 5-6 days for 2-3 times. Or use 蚜 1500 1500-2000 times liquid spray, the amount of acres is 75-100 kg, spray once every 5-6 days, for 2-3 times.
Yellow spider red spider can occur for about 20 generations a year. Adults, nymphs, larvae, eggs overwinter on the leaves of dead autumn leaves, in soil seams or on weeds. In the second year, they begin to move and reproduce with the unearthed yellow flowers. Red spiders breed faster in May, and the harm is intensified: the number has increased sharply from June to July, which is harmful to the cockroaches; the number of growth and reproduction with autumn seedlings has increased from October to November.
The method of prevention and treatment is sprayed with 40% dimethoate 1000 times liquid, the dosage of 75-100 kilograms per mu is sprayed once every 5-6 days, 23 times in a row, and can be sprayed with 25% of the medium-sized beauty bell 1000-1500 times liquid, and the dosage is 75-100. Kg, spray once every 5-6 days, 2-3 times in a row. It can also be sprayed with washing powder, diesel oil and emulsion 1:03:200 times. It can also be sprayed with a 1:1 mixture of 0.3-0.5 degree stone sulphur. Or use 4.5% high-efficiency cypermethrin 2000-2500 times liquid, spray the amount of 75-100 kg per mu. Spray once every 5-6 days for 2-3 consecutive times. If the above agents are used alternately, the effect is better.
Aphids Yellow locusts are wingless aphids. The body length is about 3-5 mm, the whole body is pink, the compound eyes are black and red, and the antennae are large. The eggs are as big as millet. The larvae are green, with 6 pairs of feet and 1 pair of horny tubes at the tail. They can secrete mucus to attract ants, and can be parthenogenetic. They can breed 8-10 generations in one year, and the generations overlap. The yellow locusts usually cluster on the back of the leaves in late May, and spread to the flower moss and flower buds in the middle and late June. The most serious damage occurred in July. The mites mainly absorb the sap on the flower buds, so that the buds can not be stretched out, and the dysplasia affects the yield and quality of the daylily.
Control method 40% Lego emulsifiable oil 1000 times liquid spray, the amount of 75-100 kg per mu, spray once every 5-6 days, 2-3 times. It can also be sprayed with 5% high-efficiency fish cyanide 3000 times liquid. The dosage of 75-100 kilograms per mu is sprayed once every 5-6 days for 2-3 times. It can also be sprayed with 25% Zhongmei Bell from 1000-1500 times, and the amount of mu is 75-100 kg. It is sprayed once every 5-6 days for 2-3 times. Or use 蚜 1500 1500-2000 times liquid spray, the amount of acres is 75-100 kg, spray once every 5-6 days, for 2-3 times.
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