July pest control of vegetables

First, the disease

In addition to continuing to focus on prevention and control of anthracnose, viral diseases, and bacterial keratoses, blight, rust, root rot, corn, and leaf spot diseases, we must focus on powdery mildew, soft rot, and Prevention of diseases such as blight and anthracnose.

1. Powdery mildew

Powdery mildew mainly affects pumpkins, gourds, cucumbers, loofahs, bitter melons and other melons and cowpeas, green beans, lentils, beans and other bean vegetables and flower seedlings. In the early stage of disease, some white, round, small spots appear on the front or back of the leaves, then they are enlarged into contiguous patches with indistinct edges, and the surface appears like a layer of white powder (conidia). Finally, the white powder turns to grayish white or Red-brown, with yellow leaves, scattered spots on the lesions, severely affecting photosynthesis. In general, the leaves of the base begin to develop and gradually develop towards the upper leaves. According to a recent survey, powdery mildew such as cucumbers and gourds have already occurred in greenhouses. In particular, when entering the information period, the precipitation is becoming more frequent and the intensity is increased. The humidity in the greenhouse, especially in large greenhouses, is high. This high temperature and high humidity condition is very favorable for the occurrence and prevalence of powdery mildew. Prevention measures are:

(1) Agricultural control measures: Base fertilizers should avoid excessive use of nitrogen fertilizers, increase phosphorus and potassium fertilizers, and provide timely ventilation and dehumidification.

(2) Chemical control technology: It should be applied at the early stage of disease. 30% Teflon wettable powder 2500-3000 times (no higher than 2000 times), 15% triadimefon (adopted on melons) 1500 times, 62.25% cents wettable powder, 4% Dow water emulsion 1500~2000 times, 10% Shigao water dispersible granules 1500~2000 times (not more than 1000 times), 40% Fuxing Emulsion 6000~8000 times, 40% WP 6,000 times Liquid spray, once every 5 to 7 days, continuous control 2 to 3 times.

2. Broom disease

The main damage to fruits and vegetables, generally originated in the Department of the Ministry, often resulting in stems longitudinal crack, flow plastic. Prevention measures are:

(1) In the early stage of disease, 75% Dakkonin (chlorothalonil) WP500~600 times liquid and 10% WDG 1500X liquid spray can be used. (2) The incidence of stem vines can be treated with 98% hymexazide WP 3000 times.

3, anthrax

It mainly affects peppers, melons and legumes. Prevention measures are:

(1) In the early stage of disease, you can use 2% preservative grams (imidamide) 1000 times, 80% anthrax WP 800 times, 40% anthrax WP 400 times, 50% carbomer 500 times, 25% carbon WP 500 times, 75% chlorothalonil Clear WP700 times, 80% of new Wansheng WP600 ~ 800 times liquid and other chemical control.

(2) Once every 7 to 10 days, depending on the condition, it can prevent 2 to 3 times.

Second, pests

Do a good job of locusts (including flowers, seedlings), thrips, diamondback moth, cabbage caterpillar, Liriomyza sativae, aphids, coccus worms, second generation of corn mash and bean cowpea flower during the prevention and treatment work. Pay attention to the prevention and control of pests such as Spodoptera litura and Spodoptera exigua in melons and leafy vegetables.

1. Gualou: In the first half of July, the occurrence of summer crops, summer cucumber, sponge gourd and other crops should pay attention to pest investigations, appropriate drug control. The prevention and control method is: timely clearing the melon and removing the leaves, the agent can be sprayed with 5% Ruijin special suspension 2000 times liquid.

2, noctuidae: Spodoptera litura, Spodoptera exigua is a kind of thermophilic pests, in late July will enter the peak period. The control method is:

(1) To promote artificial killing: According to the characteristics that the eggs are produced in the bifurcation of the leaves and the newly hatched larvae in the back of the leaves, the removal of egg masses and larval colony leaves during agricultural operations can greatly reduce the population density.

(2) Physical control: The use of frequency-vibration insecticidal light traps and kills pests.

(3) Chemical control: In the period of young larvae, pesticides can be used with 500 to 600 times the Austrian Green Suspension, 3000 to 4000 times the DuPont hits, 1500 times the 20%, 10 times the 1000 times, and 1 % of wormwood crystal emulsion 3000 times, 5% Sodium Tetrachloride 1500 times, and 0.6% Moth Emulsion 1500 times.