Control of powdery mildew of cut rose
Powdery mildew is one of the most important diseases of rose, which harms leaves, tender shoots, buds and pedicels.
Strengthen cultivation management and timely removal of disease and residue; timely pruning to improve ventilation and light transmission conditions; nitrogen fertilizer should not be too much, it is necessary to increase the application of phosphorus and potassium fertilizer.
In order to prevent and cure the disease during the growing period, 15% fenvalerate wettable powder 2000 × 400 times or 50% metoprolol wettable powder 1000 times, 50% benzoate wettable powder 1000 times, 30% flucloclozole 800 times 1000 times (pay attention to self-protection), 50% sulfur suspension (200 degrees 300 times when the onset of the disease, 400 degrees 500 times when the temperature is above 30 degrees Celsius).
In addition, sodium fluorosulfate is a poison bait with a concentration of 15%, which is used to control insect pests.
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Control of powdery mildew of cut rose
Powdery mildew is the most common disease in rose leaves. Prevention should be given priority to and prevention should be combined to achieve substantial results. The methods of prevention are: 1. Before the plant germination in early spring, a 600-fold solution of carbendazim wettable powder was sprayed to kill overwintering bacteria. two。 After spreading leaves in the following spring, Chinese rose plants were sprayed with 1000 times carbendazim wettable powder every half month for 3 to 4 times in a row to consolidate the preventive effect, or the same amount of Bordeaux solution was sprayed every half month for 3 to 4 times in a row.
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How to prevent and cure powdery mildew of rose
Powdery mildew mainly harms leaves, tender shoots, buds and pedicels of rose. After the young leaves are infected, the leaves shrink, curl into deformities, and sometimes become purplish red. The old leaf is susceptible, the leaf surface appears nearly round, water stain-like chlorotic macula, seriously damaged, the leaf withered and fell off. The damaged parts of tender shoots and pedicels were slightly enlarged and the top of them bent to the ground. After infection, the flower bud can not open or the flower posture is deformed, and the surface of the damaged part is evenly covered with white powder layer. In open field cultivated rose, powdery mildew occurred more frequently in spring (May, June) and autumn (September and October).
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