At present, it has entered the Meiyu period, with high temperatures and high humidity, which is conducive to diseases such as watermelon blight and anthracnose. Recent surveys have found that some of the watermelon fields have had blight, and the symptoms are obvious after sunny weather.
The watermelon blight is a fungal disease, which mainly damages the vines and also damages the leaves and fruits. Melon vines are affected, and the oily immersed faded cracks appear at the beginning of the joints and secrete gelatinous substances. When the disease is severe, the cranium cracks on the cracked part of the vine, and the main basal part of the crack will flow out of a gray or red jelly, and the side vine splits to produce a white oily substance. The diseased plant grew slowly or stopped, and the whole plant died severely. After the vine was dry, it became auburn. Seedlings in the seedlings were damaged, and water spots began to appear in small spots, and then spread rapidly to make the seedlings die. The onset of leaves mostly starts from the margin of the leaf and produces "V"-shaped or semi-circular brown lesions with multiple ridges. The onset of the fruit was initially a small, oil-like spot, followed by a dark-brown, round-shaped depression spot. The surface was cracked star-shaped, followed by dense black spots. The watermelon sprain does not harm the roots and vascular bundles, and a large number of small black spots and amber-like granules are produced on the lesions, which can be distinguished from anthracnose, blight, and disease.
The pathogenic bacteria are overwintering on the soil and in the frame with mycelia, conidia and ascendants. When the weather changes greatly, especially under high temperature and high humidity conditions, the disease becomes popular. Protected cultivation, low-lying terrain, poor ventilation, weak plant growth and other serious diseases.
To prevent watermelon blight, pay attention to balanced fertilization, and open a good "three ditch" in order to facilitate drainage and dehydration. The diseased fields are sprayed with anti-virus maggots 64% mildew Mn-Zn wettable powder 500 times, or 50% isoprenil wettable powder 1500 times, etc., every 5 to 7 days, continuous control 3 to 4 Times, pay attention to alternate medication. In order to avoid affecting pollination, watermelon should be applied after 4 pm after flowering. For a small number of diseased plants that can also be combined with smear treatment, combine 2 parts of 50% carbendazim WP, 1 part of 15% triadimefon wettable powder (cannot be used as an emulsifiable concentrate preparation), and mix with water to make a thin paste. Before the smear, use a knife to cut away the rot in the lesion. In addition, sick fields should pay attention to control of watering, timely removal of diseased plants and central destruction.
The watermelon blight is a fungal disease, which mainly damages the vines and also damages the leaves and fruits. Melon vines are affected, and the oily immersed faded cracks appear at the beginning of the joints and secrete gelatinous substances. When the disease is severe, the cranium cracks on the cracked part of the vine, and the main basal part of the crack will flow out of a gray or red jelly, and the side vine splits to produce a white oily substance. The diseased plant grew slowly or stopped, and the whole plant died severely. After the vine was dry, it became auburn. Seedlings in the seedlings were damaged, and water spots began to appear in small spots, and then spread rapidly to make the seedlings die. The onset of leaves mostly starts from the margin of the leaf and produces "V"-shaped or semi-circular brown lesions with multiple ridges. The onset of the fruit was initially a small, oil-like spot, followed by a dark-brown, round-shaped depression spot. The surface was cracked star-shaped, followed by dense black spots. The watermelon sprain does not harm the roots and vascular bundles, and a large number of small black spots and amber-like granules are produced on the lesions, which can be distinguished from anthracnose, blight, and disease.
The pathogenic bacteria are overwintering on the soil and in the frame with mycelia, conidia and ascendants. When the weather changes greatly, especially under high temperature and high humidity conditions, the disease becomes popular. Protected cultivation, low-lying terrain, poor ventilation, weak plant growth and other serious diseases.
To prevent watermelon blight, pay attention to balanced fertilization, and open a good "three ditch" in order to facilitate drainage and dehydration. The diseased fields are sprayed with anti-virus maggots 64% mildew Mn-Zn wettable powder 500 times, or 50% isoprenil wettable powder 1500 times, etc., every 5 to 7 days, continuous control 3 to 4 Times, pay attention to alternate medication. In order to avoid affecting pollination, watermelon should be applied after 4 pm after flowering. For a small number of diseased plants that can also be combined with smear treatment, combine 2 parts of 50% carbendazim WP, 1 part of 15% triadimefon wettable powder (cannot be used as an emulsifiable concentrate preparation), and mix with water to make a thin paste. Before the smear, use a knife to cut away the rot in the lesion. In addition, sick fields should pay attention to control of watering, timely removal of diseased plants and central destruction.