Primary transmission of the disease occurs from infected potatoes. Dormant mycelium becomes active on seedlings from diseased potatoes. Conidiophores are produced from the mycelium of the fungus. Conidia are produced in conidiophores. Conidia spread with water and wind and invade new plants.
Outbreaks of this disease are seen in Asia, North America, Europe, Caribbean Islands, Oceania, Australia, Fiji, New Caledonia, New Zealand and Papua New Guinea. If the temperature is very low in winter, there is a possibility of this disease in Bangladesh.

Potato late blight is caused by the fungus Phytophthora infestans. (But early blight of potato is caused by the fungus Alternaria solani)

100 grams of mushrooms are nutritious
1. Sugars ——————– 4.3 grams
2. Protein —————— 2.5 grams
3. vitamins
(i) Niacin —————– 3.8 mg
(ii) Pantothenic acid – 1.5 mg
(iii) Riboflavin ———- 0.5 mg
(iv) Thiamine ————— 0.1 mg
(v) Vitamin C ———— Little
4. Fat ——————- 0.1 g
5. Mineral salts
(i) Potassium ————- 448 mg
(ii) Phosphorus ———– 120 mg
(iii) Calcium ———- 18 mg
(iv) Sodium ———— 6 mg
(v) Zinc —————– 1.1 mg

1. Poisonous species are brightly colored.
2. They are acidic and pungent.
3. Poisonous species do not grow in the sun.
4. Basidiospores of poisonous species are purple in color.
5. Most species grow on wood.

1. Toxicity: Eating poisonous species of mushrooms can cause death to humans and other animals. Agaricus xanthodermus is a poisonous species. The most poisonous species are Amanita virosa and Amanita phalloides.
2. Depletion of soil organic matter: Mushrooms absorb organic matter from the soil. As a result, habitat soil organic matter decreases.
3. Destructive action: Mushrooms cause damage to wood, straw, bamboo, furniture etc.

Mushroom cultivation is a labor intensive cottage industry. The men and women of the family are cultivating mushrooms together. Family poverty is eliminated. Many mushroom industries have developed in Savar and Manikganj.

Agaricus is used to remove industrial waste, oil and pesticides from the environment.

Many people have been employed by mushroom cultivation. Mushroom industry has developed in Savar and Manikganj of Bangladesh. 780 million pounds of mushrooms are grown in the United States each year.

Mushrooms are very expensive food in different countries of the world. Foreign exchange can be earned by growing and exporting mushrooms extensively.

Thiamin, riboflavin, vitamins C, D, K and pantothenic acid are available from fresh mushrooms.