In summer, the temperature is high, the rain is heavy, and the humidity is high. Downy mildew is a major disease that damages lettuce and should be treated in a timely manner.
First, the symptoms
The disease mainly damages the leaves of lettuce and spreads upward from the lower leaves of the plants. Initially, the leaves have yellowish-yellow-circular or polygonal lesions. When wet, white mold grows on the back of the leaf, sometimes white mold will spread to the front of the leaf, the latter stage of the disease will turn into yellow-brown and become a piece, causing the whole leaf to dry.
Second, prevention and control measures
1. Agricultural measures. Properly dense planting, pay attention to drainage, reduce the humidity in the field. Implementation of 2 to 3 years of rotation, pay attention to the timely clearing of the garden after the harvest, diseased leaves, diseased plants in a timely manner out of the studio.
2. Chemical control. Available 25% metalaxyl WP 800 times, or 72.2% Precike 600 times, or 90% schisomide WP 500 times, or 58% rosin MnZn WP 500 times , Or 72% Kelu wettable powder 700 times, or 72% cream Kang wettable powder 800 times, or 72.2% wet mildew Wei agent 600 times, or 56% wet mildew wet powder 700 times, Spray once every 7 days, continuous control 3 to 4 times. To prevent drug resistance, the above pesticides can be used interchangeably.
Purple corn. Green outer leaves with a touch of lilac, ear grain is a black yo-yo, not if fruit corn sweet, but Q bomb chewiness, do not have a flavor.Sweet glutinous corn with a purple black, it is full of anthocyanins oh!Anthocyanins are water-soluble, so when boiled, the water will appear purple and black. It is a natural antioxidant that helps maintain good health.
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