At present, the autumn vegetables are growing at a prosperous period. The main planting varieties are tomato, cauliflower, zucchini, celery, and green onions. Due to the effects of several rains before and after the summer heat, vegetable pests and diseases occur more severely. According to the survey conducted by the Yongnian County Plant Protection Station on August 24-25, the rate of larvae (white) and larvae of tomato (white) were 100%, 100%, 48.5%, and 1.6 leaflets, respectively; The shed rate was 40%, the insect strain rate was 75%, the insect leaf rate was 23.5%, and the single leafworm mass was 3; the larvae rate of the beet armyworm was 10%, the insect strain rate was 20%, the insect leaf rate was 2.2%, and the leaflet insect amount was 0.02; Tomato yellow leaf curl virus disease shed rate was 100%, the average diseased plant rate was 9.2%, and the highest diseased plant rate was 65%. The field rate of Spodoptera exigua in the cauliflower was 100%, the rate of insects was 80%, the rate of insect leaves was 8.4%, the number of single-leaf insects was 0.19; the incidence of bacterial black rot was 100%, the rate of diseased plants was 100%, and the diseased leaf rate 41.8%. The rate of larvae (white) on the squash was 100%, the rate of insects was 100%, the rate of insects was 78.2%, the number of single-leaf insects was 108, the rate of insects on the field was 50%, and the rate of insects was 70%. The rate was 21.2%, the number of single leafworms was 29.5; the rate of the beet armyworm was 50%, the strain rate was 50%, the insect leaf rate was 20%, the single leafworm amount was 0.5; the celery leaf spot disease rate was 83.3%. The diseased plant rate was 74% and the diseased leaf rate was 36.9%. Weak green Onion mildew and purple spot disease mixed, sick field rate of 100%, diseased plant rate of 100%, diseased leaf rate of 61.3%; Beet armyworm insect field rate of 70%, insect plant rate of 27.3%, insect leaf rate of 6.8%, single The amount of leaf insects was 0.09. Surveys have shown that tobacco (white) mealworms occur widely in tomatoes and summer squash with large amounts of insects. The amount of single-leaf insects is 4.5 times that of the same period of the previous year. In addition to bringing yellow leaf curl virus disease to tomatoes, virus infection on summer squash also occurs. Has begun to show. The population of single leafworms of L. sativae on tomato was nearly 5 times higher than that of the same period of the year. Cauliflower and welsh onion also had higher insects than previous years, about twice the same period of the year, and most of them were newly hatched larvae. The field rate of black rot, the diseased plant rate and the diseased leaf rate of Cauliflower were 20%, 13% and 14% higher than those of previous years. The rate of leafy downy mildew disease in onion was 17% higher than in previous years. In view of the above-mentioned severe pest and disease situation, all localities should attach great importance to it, especially the newly-built solar greenhouse areas.
Control methods:
1. After nursery and transplanting, we must use "two nets (shade nets, insect nets) a film (cover film)" to protect cultivation, pay attention to the addition of 60 mesh insect nets at the vents and the entrance to prevent smoke (white) Whitefly moved in.
2. For the control of tobacco (white) mealworms, 25% of 25% pymetrozine suspension can be used, or 50% of acetamiprid (Wanxin) can be used as 2000 times liquid plus 2.5% of Lambda-cyhalothrin EC 600 times. spray.
3. Control of Liriomyza sativae can be sprayed with 20% avidin 1500-fold or 2.0% avermectin 1500-fold.
4. The prevention of viral disease can be sprayed with Greenfield God 60 times liquid or 20% oxazole copper morpholinium (Kel) WP 1000 times. The use of green wild God to be carried out after 4 pm.
5. The control of Spodoptera exigua Hübner can be controlled by 5% methylamphetamine avermectin benzoate (Kaiqiang) 2500-fold or 21% alginfenzide (Kaishuai) 1500-fold spray.
6. The control of cauliflower black rot can be controlled by using 47% king copper 1500-2000 times solution or 20% dichloroisocyanurate 500 times solution.
7. Onion downy mildew and purple spot can be used 57% acryloyl zinc (point grams) 750 times plus 25% tebuconazole (Mittal) 1500 times spray control.
8. Celery leaf spot can be controlled by 10% difenoconazole 1500 times or 25% propiconazole 3000 times spray.
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