Occurrence and control of flower diseases and insect pests in autumn

The main types of flower diseases and insect pests in autumn are: leaf spot, black spot, anthracnose, Fusarium wilt, powdery mildew, shell insects, aphids, thrips, longicorn beetles, wood bark moths, whitefly, Liriomyza huidobrensis, mites (red spiders, tarsal mites), nematodes and so on.

Leaf spot is mainly harmful to camellia, sweet-scented osmanthus, elm, orchid, pineapple, Luohansong, sunflower and so on. The general rate of diseased leaves is 15%-30%, and the heavy one is more than 50%.

Black spot is mainly harmful to rose, rose, chrysanthemum and so on. Flower damage is more common, and the damage rate is generally 20% to 40%.

There are many kinds of flowers damaged by anthrax, including orchids, evergreen, camellias, Milan, Jiuli incense, rubber trees, white orchids, gentleman orchids, taros, palms and so on. The injury rate of flower leaves is 10%-30%, and the serious one is more than 90%.

In addition, powdery mildew is harmful to crape myrtle, peony, and Fusarium wilt is harmful to palm flowers (seedling stage), chrysanthemum and so on.

Shell insects are common pests, which often damage cycads, sunflower, Magnolia, osmanthus, camellias, Michelia, Jiuli incense, banyan, elm, Fujian tea, brown bamboo and so on. Heavy occurrence occurs in the environment of high planting density and high shade, and it is easy to cause fallen leaves, withered branches and even plant death if it is not controlled in time.

There are many kinds of flowers damaged by mites, such as citrus, elm, marigold, rose, rose, cycad, bamboo and so on. Autumn is the peak of mite damage, so corresponding pesticides must be used for timely control.

In addition, thrips are often harmful to banyan and so on. Longicorn beetles and bark moths are harmful to the thick branches of transplanted banyan trees, imitation umbrella maple, cycads, etc., and the damage rate is generally 10% to 40%. Whitefly, aphid and Liriomyza huidobrensis mainly damage flowers such as chrysanthemum, peony, rhododendron and so on. The occurrence of nematodes is common and is not easy to be found. the main targets are evergreen, palms, chrysanthemums and so on.

The prevention and control of flower diseases and insect pests should give priority to prevention, especially how to avoid the epidemic of diseases caused by polluted water sources. In addition, we must prescribe the right medicine to the case and prevent it in time.

1. In the flower field, we should clean up the diseased and residual branches and leaves in time, use clean water to irrigate flowers, and reasonably arrange the planting layout of flower varieties in the field, so as to reduce the repeated infection and mutual spread of diseases and insect pests.

two。 Prescribe the right medicine to the case and apply medicine in time for prevention and treatment.

Disease control: topiramate, carbendazim, mancozeb, copper oxychloride and other pesticides can be used to control leaf spot and black spot, anthrax can be protected, 100 grams or mancozeb can be used to control powdery mildew, powdery mildew can be used to control powdery mildew.

Pest control: shell insects should be controlled with rapid culling and omethoate, mites with dacarine, propargite and diformamidine, thrips and whitefly with imidacloprid, rice planthopper and Wanling, Liriomyza huidobrensis and Badan, and nematodes with carbofuran and Milol. If the occurrence of borer pests, in addition to spraying pesticides on the surface, but also by pesticide perfusion, mixed nip smear and other methods for control.