Lettuce cultivation and pest control technology

Lettuce cultivation and pest control technology

Lettuce is a vegetable made from crunchy leaf balls, also known as western lettuce and American lettuce. It is characterized by its cool climate, avoidance of high temperature, slight frost resistance, suitable growth temperature of 15~20°C, more than 25°C, small blades, poor leaf growth, easy to cause leaf curl malformation, and early bolting, flowering and later stages. Poorly rot. In view of the reproductive characteristics of lettuce, according to the experience gained in the cultivation practices of Yuezhou Town in the Qilin District for many years, the following cultivation management opinions are proposed.
1. Variety selection and planting time: The varieties are mainly Italian lettuce. In early March, seedlings will be planted for 40-50 days and planted in early May.
2. Density of colonization: Long width 50 cm, ditch width 40 cm, ridge height 15-20 cm. The row spacing is (2030) centimeters. The depth of planting should not be deep. Mu Shi cooked farmyard fertilizer 4000-5000 kg, 15 kg of urea, 25 kg of phosphate fertilizer, combined with ridges and ridges applied under the ridge as a base fertilizer.
3, field management: planting after pouring root water, 5-7 days after planting top dressing, Mushi urea 10 kg, then poured the second water; 15-20 days after planting, chase the second fertilizer, compound fertilizer (15 : 15:15) 15-20 kg of Mushi, and weeding and weeding, followed by pouring the third water; after 30 days of planting, in order to promote close knot ball and large leaf ball, the third fertilizer was applied and compound fertilizer was still used (15:15). :15:15) 10-15 kilograms of Mushi, then poured the fourth time.
4. Pest control:
Prevention of pests and diseases is absolutely prohibited the use of highly toxic, highly toxic pesticides, to use high efficiency and low toxicity pesticides.
(1) Insect pests: mainly aphids, cabbage caterpillars, cotton bollworms, etc. Can be used once again net, imidacloprid, Qi Qisu, pyrethroid pesticides, etc., whitefly can be used Aketai control.
(2) Diseases:
1 downy mildew: first round or polygonal lesions under the old leaves, the back of the lesion when the damp layer of white mold, late lesions were brown, dry, available chlorothalonil, metalaxyl, B Phosphorus, aluminum, etc.
2 Gray mold: It was watery and decayed, with gray moldy layer, and it began to attack from near-ground leaf. Thiophanate can be controlled.
3 soft rot disease: the first disease from the edge of the leaf, the initial water immersion, after the brown, dry paper thin. The disease leaked mucus and smelled. Agricultural streptomycin can be used to control.
4 Top burning disease: also known as dry heartburn, generally appear in the inner layer of the ball tip or edge of water immersion, and the disease Department scorch brown, management should pay attention to nitrogen, phosphorus, potassium with the application, the late ball control of nitrogen fertilizer Dosage. Prevent the soil from getting too dry, too wet, and damp and dry. After the onset of the disease, spray 0.1% calcium chloride or other calcium-containing trace fertilizer.
5, harvest: lettuce from the planting to harvest, loose leaves non-heading lettuce usually takes 40-50 days, lettuce usually takes 50-60 days, premature harvesting low yield, too late harvest bolting lost the value of goods.

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