How to control rose powdery mildew?

Powdery mildew is one of the most important diseases of the Chinese rose. It damages leaves, young shoots, buds and pedicels. The prevention methods are as follows:

Strengthen the cultivation and management of timely removal of sick bodies; timely pruning, improve ventilation and light conditions; nitrogen fertilizer should not be too much, to increase the appropriate application of phosphorus and potassium fertilizers.

Chemical control

In the growing period, it can be sprayed with 15% triadimefon 2000 to 4000 times liquid or 50% chlorenone WP 1000 times; 50% benzene to wettable powder 1000 times; 30% fluconazole 800 to 1000 times. Liquid (pay attention to self-protection); 50% sulfur suspension agent (spray 200 to 300 times when the disease occurs, spray 400 to 500 times when the temperature is higher than 30 degrees Celsius).

In addition, sodium fluorosulfate is a poison bait, generally used at a concentration of 15% to control pests.

The appearance is tan, and the cork is red-brown at the flaking; there are intermittent stripes on the branches, nodules are enlarged, and the shape is like a bead. Most of the hard and delicate roots and fibrous roots are born, and some surfaces are smooth and smooth, such as stalks. It is commonly known as "crossing the river branches" or "crossing bridges"; there are brown scales on the upper part, and there are residual stems or petioles that have not been cleaned at the top. The quality is firm and hard, the section is irregular, the skin is dark brown, the wood is golden, the rays are cracked, the central pith is red and yellow, and occasionally hollow. Odorless, very bitter taste, chewing saliva can be dyed red and yellow. It is better to use fat, beaded, solid, red-yellow, no residual stems and fibrous roots.

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