Cucumber powdery mildew, commonly known as white hair, is a chronic disease, and is one of the major diseases in the middle and late stages of cucumber. Because of the appropriate conditions of temperature and humidity, cucumber powdery mildew develops rapidly. If the control is not timely or the control measures are improper , often cause the decline of photosynthesis function of cucumber leaves, cucumber premature aging, a great impact on the yield.
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? Symptoms? Cucumber leaves, petioles, stems can be dyed? However, more common in leaves. The leaves were infected and white round spots appeared on the front of the leaves, which gradually enlarged into round spots with indistinct edges. When the leaves were full, they covered the entire leaf. The diseased cloth is white and gray, covered with white mycelium, and there are many small black spots.
Pathogens Ascomycota subphylum, melon monospora powdery mildew. Department of special weak parasites, only live on the live host. Conidiophores terete, conidia oblong, colorless, unit cells. The closed cyst shell is brown, spherical, and has 1 inverted pear-shaped ascospora in its shell and 8 oval ascospores. The optimum temperature for conidia production is 15 to 30°C and a relative humidity of 75% or more.
å‘ç—… å‘ç—… å‘ç—… å‘ç—… å‘ç—… å‘ç—… å‘ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—…? Conidia spread by air currents and rain. The occurrence and prevalence of powdery mildew are favourable at a suitable temperature of 16-24°C and a relative humidity of 75%. In the case of saturated humidity, that is, water droplets on the foliage, the bacteria will break up and die. High temperature, high humidity and no condensation or improper management, cucumber growth decline, powdery mildew occurs seriously.
?? Prevention methods
?? 1, selection of disease-resistant varieties. For example, Jin No. 2, No. 4, No. 6, Jin No. 1, No. 2, etc.
?? 2, strengthen the cultivation and fertilizer management. Potassium and potassium fertilizers were added to increase the disease resistance of the plants. Pay attention to ventilation, light transmission, and humidity in the booth.
3, chemical control. The optional protective agents are various sulfur preparations, such as 50% sulfur suspension 500 times, 40% 600 times of the Kokonin suspension, 75% chlorothalonil 600 times, 80% Sanderson wettable powder 600 times, 80 % Dasheng M-45 WP 600 times.
There are 50% carbendazim WP for 600~800 times, 40% Fuxing EC for 6000~8000 times, and 10% WSG granules for 2000~3000 times, and 20% for Fuqing Moisture. Powder 1,000 to 1200 times, Goodrich 43% Suspension 3000--4000 times, 25% Beautilazole 5000-6000 times, 50% Topozin WP 1000 times, 62% Faircoin WP 800 times Wait.
The use of protective agents should be early, if the disease has been made, should use a systemic bactericide, continuous 3 to 4 times, the interval is generally 7 to 10 days. The agents that are more sensitive to melons are triadimefl and fuxing, and triadimefon has good control of powdery mildew, but it cannot be used on cucumbers. Because triadimefon significantly inhibits the growth of cucumber, the growth of cucumber is particularly slow within 1 month after use, directly affecting its economic benefits, and should be used with caution.
? Symptoms? Cucumber leaves, petioles, stems can be dyed? However, more common in leaves. The leaves were infected and white round spots appeared on the front of the leaves, which gradually enlarged into round spots with indistinct edges. When the leaves were full, they covered the entire leaf. The diseased cloth is white and gray, covered with white mycelium, and there are many small black spots.
Pathogens Ascomycota subphylum, melon monospora powdery mildew. Department of special weak parasites, only live on the live host. Conidiophores terete, conidia oblong, colorless, unit cells. The closed cyst shell is brown, spherical, and has 1 inverted pear-shaped ascospora in its shell and 8 oval ascospores. The optimum temperature for conidia production is 15 to 30°C and a relative humidity of 75% or more.
å‘ç—… å‘ç—… å‘ç—… å‘ç—… å‘ç—… å‘ç—… å‘ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—… ç—…? Conidia spread by air currents and rain. The occurrence and prevalence of powdery mildew are favourable at a suitable temperature of 16-24°C and a relative humidity of 75%. In the case of saturated humidity, that is, water droplets on the foliage, the bacteria will break up and die. High temperature, high humidity and no condensation or improper management, cucumber growth decline, powdery mildew occurs seriously.
?? Prevention methods
?? 1, selection of disease-resistant varieties. For example, Jin No. 2, No. 4, No. 6, Jin No. 1, No. 2, etc.
?? 2, strengthen the cultivation and fertilizer management. Potassium and potassium fertilizers were added to increase the disease resistance of the plants. Pay attention to ventilation, light transmission, and humidity in the booth.
3, chemical control. The optional protective agents are various sulfur preparations, such as 50% sulfur suspension 500 times, 40% 600 times of the Kokonin suspension, 75% chlorothalonil 600 times, 80% Sanderson wettable powder 600 times, 80 % Dasheng M-45 WP 600 times.
There are 50% carbendazim WP for 600~800 times, 40% Fuxing EC for 6000~8000 times, and 10% WSG granules for 2000~3000 times, and 20% for Fuqing Moisture. Powder 1,000 to 1200 times, Goodrich 43% Suspension 3000--4000 times, 25% Beautilazole 5000-6000 times, 50% Topozin WP 1000 times, 62% Faircoin WP 800 times Wait.
The use of protective agents should be early, if the disease has been made, should use a systemic bactericide, continuous 3 to 4 times, the interval is generally 7 to 10 days. The agents that are more sensitive to melons are triadimefl and fuxing, and triadimefon has good control of powdery mildew, but it cannot be used on cucumbers. Because triadimefon significantly inhibits the growth of cucumber, the growth of cucumber is particularly slow within 1 month after use, directly affecting its economic benefits, and should be used with caution.
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