How to treat diseases on the American red maple

Entering summer, the weather gets hotter and hotter, and this is exactly the time when diseases and pests start to occur on the American maple (American red maple). So how do you treat diseases on the American red maple?

1. How to treat diseases on the American red maple

Diseases of the American red maple include powdery mildew, leaf spot, bacterial shot hole, etc.

1. For powdery mildew, spray 1-2 times with a 1000-fold dilution of 25% triadimefon wettable powder.

2. For leaf spot, use a 500-600-fold dilution of 80% mancozeb or a 500-fold dilution of 50% captan, etc. From June to September, because of the high temperature and high humidity, this is the period when leaf spot occurs, so it is best to spray a fungicide once every half month, and the fungicides should be used alternately to prevent the pathogen from developing resistance.

3. For bacterial shot hole, spray a 3500-fold dilution of 72% agricultural streptomycin sulfate wettable powder, spraying 2-3 times, with an interval of about 15 days each time.

2. Methods for preventing and controlling diseases and pests

1. Low-cost control: beta-cyfluthrin + imidacloprid + abamectin. Taking Shandong as an example, starting from April 20 on the solar calendar, once every two months, four times a year in total, can control more than 99 percent of pests. In areas with severe pest problems, one additional spray can be applied on June 5. Then, starting 15 days before the Mid-Autumn Festival, inspect all the trees; if there is wood dust on the ground, it is from longhorn beetle larvae that have not been eliminated feeding, if it is coarse wood dust scattered around, it is basically a borer in the upper part of the trunk, and a small concentrated pile of fine wood dust is generally a borer underground. You can dilute dichlorvos plus phoxim 10-fold and inject it into the insect holes with a syringe, which can basically kill all borers. This method combines killing and repellency, with low drug cost and relatively low labor.

2. High-cost control: taking Shandong as an example, from April 20 on the solar calendar, spray beta-cyfluthrin on the leaves to control green plant bugs; on May 20, spray acaricides such as abamectin on the leaves; spray microcapsule longhorn beetle control agents such as Green Weilei on the trunk and thick side branches until the trunk and thick side branches are all soaked; on June 20, continue spraying a mixture of acaricides such as abamectin and beta-cyfluthrin on the leaves; on July 5, spray microcapsule longhorn beetle control agents such as Green Weilei on the trunk and thick side branches for the second time; on July 20, spray beta-cyfluthrin and abamectin on the leaves for the last time. This method is rather cumbersome. Starting 15 days before the Mid-Autumn Festival, check the trees and handle them as described in 1.