Identification and control of Anthracnose

2022-06-09 0 By

Aniseed planting process, more extensive management, resulting in serious harm to anthrax, affect the yield and quality of aniseed.Therefore, in the process of planting anthracnose, attention should be paid to the occurrence of anthracnose and reasonable prevention.The following will briefly introduce the harm, identification and control measures of anthracnose.A, harm symptoms of anthrax mainly harm leaves, tender shoots, flowers, young fruit.In the early stage of the disease, the leaves showed small brown water-stained spots, which gradually expanded to form irregular large brown spots. In the late stage, the middle of the spots became gray brown, with many small black spots, and the spots then showed a wheel-shaped pattern.When the harm is serious, lead to leaf shedding, dormant bud germination, waste of nutrition, flower is poor.The tender tip of the first occurrence of water stain like brown spots, then expand into black rot spots, leading to the rapid death of the tender tip of the star anise.Flowers and young fruits are mainly affected on pedicels and fruit stalks, and branches with mechanical damage are also susceptible to the disease, and the symptoms are the same as those of tender shoots.▲ leaf onset ▲ anthracnose after the harm, anthracnose leaves fall off, tree weakened ▲ anthracnose caused a large number of leaves fall off ▲ Anthracnose caused early deciduous and extraction of new shoots two, the main source of the pathogenesis of anthracnose is fungus, belongs to half know bacteria subphylum, black plate sporaceae, trichosporaceae.When the harm occurs, the mycelium and conidia will adhere to the bark and the mechanical wounds of branches for overwintering, and the next spring will be spread by wind and rain.Generally in late April to early May began to come on, as long as the temperature and humidity is appropriate, it is very easy to come on, to July – August in star anise blossom, is the peak of the disease throughout the year, serious will cause a large number of falling flower production.The incidence is higher in areas where rain is evenly distributed and the climate is warm. Extensive management, canopy shade, high temperature and high humidity also facilitate the spread of the disease.01 Agricultural prevention and control (1) Clear the piles of dead branches and fallen leaves and weeds in the park to reduce the source of germs.(2) Cut off over-dense plants, cut off diseased and insect branches, thin branches, dead branches, internal branches, over-dense branches, crossed branches, overlapping branches, enhance the ventilation and light transmitability of the tree body, reduce the relative humidity in the star Anise park.(3) Scientific and reasonable fertilization, enhance tree potential, improve disease resistance.02 Chemical prevention and control Before the onset of disease, use Guoguang Lisheng for prevention, use Guoguangjian or Bixian for prevention and control.