Disease of Ganoderma lucidum: Paecilomyces

Paecilomyces (paecilomyces) belongs to semi-knowing subphylum, Trichospora, Trichospora, Trichosporaceae, Paecilomyces. Paecilomyces wamsoni (p.varictBainier) is common in production.

1. The morphological characteristics of hyphae are white, transparent and septate. The colony is yellowish and is often mistaken for Aspergillus flavus, commonly known as aflatoxin by mushroom farmers. Conidiophores arising from aerial hyphae or corded hyphae, peduncles slender, base dilated, apex pointed, often curved, single to broomlike branches. Conidia are short columnar, long oval, smooth and arranged in chains, and some strains produce macrospores.

two。 Morbidity regularity

The main results are as follows: (1) the route of transmission is widely distributed in soil, air and various substrates, which has strong corrosiveness and can erode high polymers such as electrical equipment, rubber, plastics and so on. Spores are spread by airflow, and seed production and bag planting are often infected in large numbers.

(2) the occurrence conditions of Paecilomyces are suitable for medium temperature and humid environment, unsanitary culture site and poor ventilation are the main conditions of the disease.

3. The damage symptoms grew rapidly on PDA medium, and the hyphae were white at the beginning, and then gradually produced conidia from the center to the edge of the colony, which changed the colony from light yellow to powdery mildew layer. It grows rapidly in the culture material, yellowish and fluffy. It grows rapidly and usually completes a generation in 3 days. Colony expansion type, once the pollution quickly occupied the whole material layer, strain expansion and cultivation all failed.

4. Prevention method

(1) to do a good job in sanitary work, the site is irregularly sprayed with 500 times 70% methyltopril for sterilization.

(2) pay attention to ventilation and keep the air dry in the culture room. Before the culture rack is discharged into the bacterial bag, it should be sprinkled with a layer of fungicide dry powder to prevent the occurrence of miscellaneous bacteria.