Weather forecast for January and June
The average temperature in mid-June was 26.4 °C, which was higher than the average of the same period in the calendar year and close to the same period of the previous year; the total precipitation in the tenth month was 0.6 mm, which was less than the value of the same period in the calendar year and the same period of the calendar year. It is suitable for the occurrence of cotton pests and diseases, especially cotton leaf mites and cotton blind bugs. Temperatures are expected to be normal in late June, with slightly more precipitation. The average temperature of the tenth is about 26.5 °C, which is close to the average of the same period of the calendar year, which is slightly lower than the same period of the previous year; the precipitation in the tenth month is expected to be about 8mm, which is slightly more than the average of the same period of the calendar year and significantly more than the same period of the previous year. Suitable for the occurrence of cotton aphids.
Second, the current occurrence of diseases and insect pests and the prediction of later trends
1. Cotton bollworm:
According to recent surveys in the field, the rate of cotton bollworm insect strains is 0.05-1%. The amount of eggs dropped is small, the value is smaller than that of the same period last year, in mid-June, a generation of cotton bollworms entered the peak period of soil pupae, some early cotton bollworms began to feather, and it is expected that the end of June and the beginning of July will enter the peak of a generation of cotton bollworm feathering
2. Cotton leaf mite:
Due to the recent temperature suitable for the breeding of cotton leaf mites, while the mechanism and artificial field operations increase, wind frequency, is conducive to the spread of cotton leaf mites, accelerate the increase in the number of cotton leaf mites in the field, according to the site fixed point survey daily growth of 58%, there is a red leaf phenomenon, individual single plant harm is heavier, there is a leaf shedding, recent cotton field survey has a mite plant rate of 2-8%, 100 plant mites 6-120 heads, eggs 4-35 grains, higher than the same period last year, it is expected that the cotton leaf mites in late June have a trend of aggravating harm.
3. Cotton aphid:
Due to the use of the drugs imidacloprid and acetamidine to control cotton blind bugs, inhibiting the breeding of cotton aphids, the number of natural enemies in cotton fields has risen, cotton aphids have grown very slowly in the field, in the form of central plants, the number of field populations is small, the recent survey of aphid plants rate of 0.05%, close to the same period last year, with the increase in irrigation, the recent rainy weather will accelerate the proliferation of cotton aphids.
4. Cotton blind bug:
Cotton into the bud stage, the number of cotton blind bugs in the field increased, the recent investigation of insect plants rate of 2.1%, 100 plants of insect mouth 3-5 heads, harm plant rate of 10%, moth bud rate of 0.1%, especially in the partial cotton field, the bud rate reached 0.5%, more harmful than the same period last year, due to the cotton growth period later than last year, no flowering, it is expected that cotton blind bugs continue to harm in late June.
5. Double-spotted fluorescent leaf beetle:
Due to the high temperature weather in early June, the humidity in the field weakened, suitable for the occurrence of double-spotted firefly nails, june 9 in the cotton field found double-spotted firefly nail hazards, recent investigation, 100 plants of insect mouth 3 heads, harm plant rate of 5%, did not reach the control indicators, double-spotted firefly nails mildly occurred.
6. Cotton "two diseases":
Recently the temperature is high, with the development of irrigation, field humidity increases, cotton "two diseases" have an increasing trend, the recent survey incidence rate of 0.5-3%, a wide variety of varieties, nitrogen fertilizer stocking increased, cotton is about to enter the initial flowering period, it is expected that the disease will increase.
3. Investigation of natural enemies
Recent cotton field survey: 1.5 head of 100 ladybirds, 0.5 heads of small flower bugs, 4 heads of spiders, and natural enemies show an increasing trend.
Fourth, the next stage of plant protection work suggestions
Earnestly do a good job in field investigation, synthesize the occurrence trend of various diseases and insect pests, and improve the accuracy of prediction and forecasting of diseases and insect pests. Deeply grasp the comprehensive prevention and control, carry out the integrated development of green prevention and control and unified prevention and control, publicize the use of scientific drugs, prescribe the right medicine, accurately apply drugs, alternately use pesticides, and improve the effectiveness of prevention. Implement pesticide pest control and reduction
1. Cotton bollworm: using the enticing technology, place insecticide lamps, moth traps, willow branch handles, food attractants, etc., reduce the base number from the source; do a good job in prevention, improve the prediction and forecasting ability, spray phosphorus to reduce the amount of eggs in the field; scientific medicine, give priority to the use of cotton bollworm nuclear polyhet virus, kale nocturnal moth nuclear polyhedravirus or Bt. preparation (insect-resistant cotton field prohibited), indigovir and other biological source agents control; chemical agents can choose chlorhepast benzamide, filamentosomidamide, methylamino avermectin benzoate and other prevention and control.
2, cotton leaf mites: adopt the principle of treating early, curing less, cure the field census, be ruthless to cotton leaf mites, and strengthen the prevention and control of central plants and spot chips. Find the cotton leaf mites inserted well marked and take the ring to dot. Scientific use of medicine, the right medicine. For mite plants with a rate of more than 5%, manual and mechanical cooperation, the use of eggs and young mites, adult mites co-killing of long-acting specialized acaricide agents, focusing on the alternating use of pesticides, to avoid resistance, at the end of June, the leaf mites are controlled in the central plant stage.
3, cotton aphid: place a yellow card, block the migration of cotton aphids, delay the time of cotton aphids entering the ground, use biological agents, protect natural enemies, achieve the purpose of beneficial harm control, and control the occurrence and spread of cotton aphids.
4, cotton blind bugs: conscientiously do a good job in field census work, the implementation of standard prevention and control, 100 insect populations reached 5, grasp the prevention and control methods, time, agents, intervals and so on. The time of the drug is before 9 am and after 21 pm. The agents are acetamiprid, thiamethoxam, avermectin and flufenamide. The interval between doses is 7-10 days.
5. The two committees led the staff to carry out the study of pesticide management regulations, be a good ecological guard, prohibit the use of highly toxic pesticides, and do a good job in cleaning up pesticide packaging.
Author: Li Hongli, source: 128 regiment agricultural technology extension station, graphic editor: Tianshan plant protection, reprint please indicate the source!