How to treat the disease of American red maple

As summer approaches, the weather gets hotter and hotter, and it is time for pests and diseases to begin to occur in American maple. So how does the American red maple have disease?

How to cure American red maple disease

The diseases of American red maple include powdery mildew, leaf spot, bacterial perforation and so on

1, powdery mildew with 25% triadimefon wettable powder 1000 times spray 1-2 times.

2, leaf spot disease with 80% mancozeb 500-600 times solution or 50% captan 500 times solution. June-September due to high temperature and humidity is the occurrence period of leaf spot disease, it is best to spray a fungicide every half month, fungicides should be used alternately, so as not to produce resistance.

3. Bacterial perforation disease should be sprayed with 72% agricultural streptomycin sulfate wettable powder 3500 times solution, sprayed 2~3 times, each time the interval is about 15 days.

II. Prevention and control methods of diseases and insect pests

1. Low-cost control: cyhalothrin + imidacloprid + abamectin, taking Shandong as an example, from April 20 of the solar calendar, once a month every month for a total of four times a year, can control more than 99% of pests. Areas with serious pest problems can be hit again on June 5. Then in the Mid-Autumn Festival 15 days before the start of inspection of all trees, there are sawdust on the ground for the undestroyed longicorn larvae nibble, if it is coarse sawdust scattered distribution, basically there are moths on the upper part of the trunk, fine sawdust is concentrated in a small pile is generally underground moths, can be diluted with dichlorvos and phoxim 10 times injected into the insect hole with a needle, basically can kill all moths. The method integrates killing and avoidance, has low cost and saves labor.

2. High cost prevention: Taking Shandong Province as an example, polycyhalothrin was sprayed on the leaves to control Lygus lucorum on April 20 of the solar calendar. On May 20, abamectin and other acaricides were sprayed on the leaves. Green Weilei and other microcapsule acaricides were sprayed on the trunk and thick lateral branches until all the thick lateral branches of the trunk were wet. On June 20, the mixture of abamectin and polycyhalothrin was continuously sprayed on the leaves. On July 5, green Weilei and other microcapsule acaricides were sprayed on the trunk and thick lateral branches for the second time. The last foliar spray of cyhalothrin and abamectin on July 20 was cumbersome. Check trees 15 days before Mid-Autumn Festival and treat them as described in section 1.