Harmful symptoms and Control methods of Edible fungus Trichoderma

The main biological characteristic of harmful symptom Trichoderma is that its mycelium maturation period is very short, which can reach physiological maturity within one week, and then produce green mold layer, that is, its spore layer. When the base material is infected, the mycelial stage is not easy to detect and can not be noticed until the mildew layer appears. At first, it was only dotted or patchy, but when the conditions were right or the mycelium of edible fungi was not very strong, it quickly developed into flakes until the whole bag or material bed was polluted. if measures are not taken in time, the mushroom shed will turn green in a short time, and its spores will fly. A large number of Trichoderma spores will also be attached to the surrounding shed walls, leaving serious hidden dangers to future production.

Trichoderma mainly lives in rotten wood, litter, soil, organic fertilizer, plant residues and air. In many cultivated old mushroom houses, the mushroom utensils and places with bacteria are the main sources of primary infection, and the conidia produced by the disease can be repeatedly infected more frequently. The incidence of Trichoderma is closely related to the environmental conditions. The germination rate of Trichoderma spores is higher at 15-30`C, the mycelium can grow at the temperature of 4-42`C, and the fastest growth is at 25-30`C. Spores germinate fastest when the air relative humidity is 95%, but it is difficult to germinate when the relative humidity is lower than 85%. Therefore, it is easy to breed Trichoderma in the condition of high temperature, high humidity, poor ventilation and acidic culture material. After infecting the host, Trichoderma competes with the host for nutrients and space, and at the same time secretes toxins to kill and kill the host, winding and cutting off the hyphae of the host.

Prevention and control measures:

In seed production or clinker cultivation, 1000 times verrucine was added in proportion and sterilized strictly to kill its spores thoroughly.

Scientific allocation of base material components to make nutrition comprehensive and balanced, in order to ensure the health and resistance of edible fungus hyphae, and can form antagonism or inhibition to mold. Practice has proved that Pleurotus ostreatus can be added in proportion to the production.

In fermentation cultivation, after adding verrucine, the base material should still be fermented evenly and kill or inhibit its spores as much as possible.

The inoculation operation should be strict and standardized so as not to make the mold spores fall into the material. The study found that during inoculation, the operation was carried out after turning on the edible fungus inoculation and purification machine 5min, the production effect was similar to that of conventional formaldehyde fumigation, and the stimulation of formaldehyde to the human body was eliminated, and the possibility of formaldehyde residue was avoided.

During the period of strain or bag infection and mushroom emergence, spraying 30-50 times Venus disinfectant or 1000 times verrucine on the spare space of the mushroom shed every 5 days or so is the most effective prevention method at present.

After the discovery of Trichoderma, spray or inject or smear the contaminated area and bacterial bag with 500x verruca in time, the effect is remarkable, and the seriously polluted bacterial bag should be incinerated or buried in time.