Is there any pesticide that can make lettuce not bend, lettuce with pesticides

How did the 2 people upstairs run to the **. Ten years ago, I was probably okay with this question, but I don't know about it now. It's been a long time since I've been away from the countryside.

Does lettuce bend refer to a stem? I think this has something to do with the variety. Pesticides should be similar, go to the agricultural station and ask them they will tell you, but what pesticides are easy to use, you have to use and explore for a long time to know, after all, planting and growing vegetables is also very technical, and you need to work with experience.

Prevention and control measures. 1.Key points of plant protection.

Improve cultivation management technology and strengthen agricultural disease prevention measures: the soil needs to be deeply exposed to the sun before planting, and crops such as beans and onions and garlic are the best in the previous crop; The terrain should be drained and irrigated, which is convenient to prevent soil clay and heavy; Sowing and planting at the appropriate time to avoid the susceptibility stage of the heart wrapping period and the local rainy season; When the lack of water and fertilizer or squatting seedlings for too long, the soil grows vigorously after the cracked roots or flood irrigation, and the petiole is prone to natural cracks, which often causes opportunities for pathogen infection, so it is necessary to increase the application of bottom fertilizer and timely irrigation and top dressing"Push to the end", constantly remove the rotten leaves of diseased plants, and apply slaked lime in the hole for sterilization.

Pest control and avoid insect wounds: pathogens are very easy to invade from insect wounds caused by pests such as yellow-striped jumping beetles, cabbage worms, cabbage armyworms, diamondback moths, turnip leaf wasps, ape leaf worms, ground maggots, etc., and the insect body can also carry bacteria, resulting in the spread of diseases. Therefore, pesticides should be applied in time.

Lepidopteran pests can be sprayed with 800 l000 times of dimethoate, 1000 2000 times of 40% dimethoate, 2 000 times of trichlorfon raw powder, and 1000 1500 times of 50% dichlorvos emulsifiable concentrate. Beetles were sprayed with 90% crystal trichlorfon 1000 times, 80% dichlorvos emulsifiable concentrate L500 2000 times solution sprayed or irrigated to kill larvae; The adults and larvae of seed flies and radish flies can also be sprayed and irrigated with the above agents, and 50% phosphine emulsifiable concentrate can also be used, 125 150 grams per 667 square meters of water, or trichlorfon powder, alphabet powder, 5% carbaryl powder per 667 square meters 1 kg of soil treatment, trichlorfon powder can also be sprayed to control adults, the dosage is the same as before.

Choose disease-resistant varieties adapted to local conditions: most varieties resistant to viral diseases and downy mildew are also resistant to soft rot; Varieties with erect outer leaves, thick leaf wax powder, and dark green color are generally more resistant to disease than soft and juicy varieties with outer leaves close to the ground, thin leaf wax, and yellow-green color.

Pharmaceutical prevention and control: before and at the beginning of the disease, spray 200 mg liters of agricultural streptomycin or neophytomycin at the base of the petiole and stem near the ground in time, 1000 times of dixone powder or 800 times of 38% oxapyroxystrobin, or 600 800 times of 50% dyscetonium, or 400 600 times of 77% copper hydroxide wettable powder, or 300 mg of chloramphenicol, spray 1 time in 7 10 days, a total of 2 3 times, and the heavy ones will be irrigated.

2.Medication regimen.

1. Prevention plan: 38% oxazine copper strobin is diluted and sprayed with 1000 times of liquid, and the drug is used once every 7 days.

2. ** plan: when the disease is mild, 38% oxazine copper strobin is diluted and sprayed according to 800 times, and the drug is used once every 5-7 days; When the condition is severe, it is sprayed according to 600 times dilution of the solution, and the drug is used once every 3 days, and the number of sprays depends on the condition.

<> lettuce is a four-season vegetable and fast lettuce, the growth cycle is relatively short, it is not easy to grow insects, and there is no need to use pesticides under normal circumstances. The essence of Wang control is to damage the growth point of the plant, control the growth of the plant, so that the plant only grows, does not bear fruit, for the lettuce control Wang can generally play mequartin, paclobutrazol, chlorophyll, potassium dihydrogen phosphate and other pesticides, pay attention to the amount of pesticides can not be too much.