There are two kinds of pathogens causing fusarium wilt, one is Septoria and the other is Fusarium. The pathogenic bacteria of the genus Aspergillus spp. in fruiting leaves with fruiting bodies and hyphae.
In the following year, the leaves of Salix matsudana and Salix psammophila begin to spread after leaf spreading, resulting in lesions. The constipation and conidia are produced on the later stages of the disease, and are spread by wind and insects. Summer rainfall, high temperature and humidity are favorable conditions. Infestation and morbidity.
Fusarium bacteria can survive for 3-5 years in the diseased tissue. When the bacteria entity is overwintering in the diseased part of the diseased plant, the primary invasive source is the shoot tip and the dead branch on the diseased plant, and the diseased spots in the April-June period in the following year are gradually generated. Solid, from mid-May to mid-to-late June, rainy days, when air humidity is saturated, capsular spores are released and transmitted through the wind. Ascospores germinate in water droplets and directly invade through wounds. It is the branch from late May to mid-June. When the leaves are flourishing, it is the appropriate time for the invasion of the bacteria. The incubation period of the bacteria is 1-2 months. In the middle of July, the diseased parts appeared.
Bacterial wilt disease mainly damages the leaves and branches of Salix psammophila and Salix psammophila. The lesions are found on the leaves and shoots at the initial stage and appear light brown spots. Because of the environmental impact, it is difficult to find, and then the disease spots expand continuously, expanding up and down into ribs. Shape, or upward expansion into a tongue shape, yellow-brown lesions from July to August is the peak of onset, lesions continue to grow to shoots, causing leaves yellow, withered off, weakening the tree vigor until death.
In October, the lesions stopped expanding. In the following spring, many sickle-like protrusions grew on the above-mentioned lesions. After the wet period in May-June, the sickle-like protrusions were longitudinally split and black elongated elongated papillae were opened. For pathogenic entities, which further damage the leaves and shoots.
Control methods:
1. Strengthen seedling quarantine. Due to the influence of climate, the trees in the streets of Guoyang County are mainly transported from other counties. When transporting seedlings, the quality of seedlings must be strictly controlled to prevent the import and spread of plant diseases.
2, physical control. Strengthen management, and choose robust and disease-free seedlings when planting. The branches and leaves of pests and insects are promptly cleaned up, and the litter is collectively treated to prevent repeated infection and spread of the disease by human hands during pruning. Timely watering, timely fertilization, loose soil, timely weeding, to avoid soil compaction, in order to facilitate soil air circulation, promote plant growth and robustness, and improve disease resistance. In April of each year, lime is used to whiten the stems from the roots to the DBH to prevent the invasion of the disease.
3, chemical control. In the middle of April or May, can be sprayed with 50% carbendazim 800 times, sprayed every 7 days, sprayed 2-3 times in succession, or sprayed with 50% mancozebite 700 times. Control effect.
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