In summer, the temperature is high, the rain is high, and the humidity is high. Downy mildew is a major disease that is harmful to lettuce. It is necessary to pay attention to timely prevention and treatment.
First, the symptoms
The disease mainly affects the leaves of lettuce, which spreads upward from the lower leaves of the plants, and the leaves initially have pale yellow near-circular or polygonal lesions. When it is wet, white mold grows on the lesions on the back of the leaves. Sometimes the white mold spreads to the front of the leaves. In the later stage, the lesions turn to yellowish brown and form a piece, causing the whole leaves to dry up.
Second, prevention measures
1. Agricultural measures. Reasonably close planting, pay attention to drainage and reduce the humidity in the field. Carry out 2 to 3 years of rotation, pay attention to timely clearing the garden after harvest, and clear the diseased leaves and diseased plants out of the shed.
2. Chemical control. 25% metalaxyl WP 800 times solution, or 72.2% Plex water 600 times solution, or 90% fox cream WP 500 times solution, or 58% arsenic manganese Zn WP 500 times solution , or 72% ke WP 700 times solution, or 72% sturdy WP 800 times solution, or 72.2% Frost mold water 600 times solution, or 56% Phytophthora WP 700 times solution, Spray once every 7 days and continuously control 3 to 4 times. In order to prevent drug resistance, the above pesticides can be used interchangeably.
Plant Support Net also named plant support netting,Pe vegetable netting is a solid versatile plastic mesh, designed to provide both vertical and horizontal support to climbing plants or vegetables and horizontal support to long-stemmed flowers.Used vertically, it can support crops like beans and peas till the crops are at their heaviest and ready for harvesting.
Laid horizontally, Plant Support Net in layers becomes a fairly effective guide to space-keeping in planting. Successive layers can be fixed at brackets with the continuing growth of plants. This method has been widely adopted by flower growers especially for long-stemmed ones like chrysanthemum, freesia and carnation.
Plant Support Net is clean, economical, harmless to delicate stems or leaves, and quite easy to fix. At the end of planting season, it can be quickly dismantled and rolled up for subsequent use.
Plant Support Net
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