I. Cotton Bolling Stage Pests and Diseases: The degree of comprehensive occurrence is moderately mild (Grade 2), in which four generations of Helicoverpa armigera are minor (Grade 1); Bemisia tabaci occurs moderately mild (Grade 2); The degree of moderate occurrence (level 3); Minor nymphalidae and C. grandis were all mild.
1, four generations of cotton bollworm: the occurrence of a degree, the egg period of August 29 - September 3, 3 days later than usual.
Forecast basis: 1 The base number of insects is low: According to surveys conducted around August 10 in all counties of the city, the city’s average cotton field has an average of 0.92 per 100 remnant insects, corn field has 100 remnants of 0.2 insects, soybean field has 100 remnants of 0.1 remnants, and three generations of cotton bolls. The total number of insect residue bases is relatively low for years. 2 The development progress is slightly late: The development of the third generation H. armigera residues is slightly later than usual. According to the survey conducted on August 10th in the city, the first instar larvae account for 0%, the second instars 5.1%, the third instars 30.54%, and the fourth instar accounts for 46.28%, the fifth instar accounted for 15.3%, and the sixth instar accounted for 2.78%. The development progress was slightly later than usual. 3Climatic impact: In the previous period, the city had more precipitation and more precipitation, some land masses caused internal hail, and it was not good for three generations of old larvae of cotton bollworm. According to meteorological forecast, the average temperature in August-September was slightly higher than normal, and the precipitation was slightly more than normal. The overall meteorological conditions were unfavorable to the fourth-generation cotton bollworm. 4 Host conditions: The city's cotton has entered the late growth stage. Due to continuous precipitation in the early period, some of the cotton fields have experienced premature aging, which is not conducive to the occurrence of four generations of cotton bollworm in the cotton fields. 5 Natural enemies: As precipitation is slightly more than usual, it is expected that the fourth generation of the drugs will be less, which will benefit the survival of natural enemies and will play a certain role in controlling the bollworms.
2. Bemisia tabaci: Occurrence level 2, should be contiguous prevention and control after August 25.
3. Cotton Blindness: The degree of occurrence was level 3. According to investigations conducted around the city on August 10, the average broken leaf rate in the city was 16.7%, and serious land mass was up to 32.4%.
4. Minor nymphalidae and cotton big leafhoppers: all occur slightly.
Second, control indicators:
Four generations of cotton bollworms: five young larvae
Bemisia tabaci: 20 leaves of nymphs on the average leaf of the upper, middle and lower leaves of the tobacco planthopper
Cotton Blindness: 100 heads and 10 heads
Small bridges made from cotton: 100 heads per 100 heads
Cotton leaf roller: 100 heads per 100 heads
III. Integrated pest control measures for cotton boll opening stage:
1. Agricultural measures: The three generations of cotton bollworms are to be cleaned up to relieve the pressure of four generations of prevention and treatment. Foliar spray fertilizer is applied to promote rejuvenation of plants and improve insect resistance of insect-resistant cotton.
2. Chemical control: The four generations of cotton bollworm can be controlled by 2.5% suspension of polymycin, 1000 times of 5% fluometuron EC, 1000 times of 1% emamectin benzoate EC, 24% Methoxyfenozide suspension agent 750 times, 15% Indoxacarb suspension agent 3500 times liquid and other agents for spraying prevention, pay attention to alternation, rotation of medication, in order to improve the control effect, delay the resistance of cotton bollworm. The control of cotton blind catfish can be carried out with 40% chlorpyrifos EC 100 ml/mu, 1% emamectin benzoate 50 ml/mu, and 45% malathion EC 600 times in young instar nymphs. Spray control. The control of Bemisia tabaci can be used 5% Rui Jin special 20 ml, 25% imidacloprid WP 10 g or 20% acetamiprid EC 20 ml, spraying in the morning or evening on the back of the leaves, interval 5-7 days and then once again. Bemisia tabaci has a great variety of crops and has a certain ability to migrate. Concentration and control can receive good results.
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