Powdery mildew

infected yet. It depends on the cultivar how soon after infection this happens. In apple, pear, outdoor grown rose and other Rosaceae , the fungus causing [...] greenhouses, dispersal of spores over small distances (limited time) mostly happens via workers’ clothing. How to prevent Powdery mildew Use resistant cultivars

Angular leaf spot

rain, irrigation water or handling of the plants. Infection of the plants happens both passively and actively. Infection and disease development are favoured

Pierce's disease of grapevine

the shoots get shorter internodes. Infected vines eventually die. This happens faster in younger vines than in older ones and faster in susceptible cultivars [...] difference between infected and healthy trees. Normal fruit abortion does not happen so total production remains similar, with more smaller fruits in infected

Wheat bunt

grow between the plant cells and eventually inside the kernels. When that happens, the fungal mycelium turns into teliospores and the whole kernel becomes

Tomato russet mite

serious cases they may snap. The fruit can also be affected, and when this happens in tomatoes, the skin becomes coarse and turns reddish brown and the fruit

Dwarf bunt

between the plant cells and eventually grow inside the kernels. When that happens, the fungal mycelium turns into teliospores and the whole kernel becomes

Apple scab

further growth of the fungus. In cultivars that are more resistant, this happens faster so the lesions remain smaller. Based on the research that has been

Phytophthora blight

to be returned to the soil from infected plants. Dispersal in the soil happens via water, since the zoospores can readily move through water. This explains

Bacterial wilt, brown rot

young plants through infected tubers, the wilting and collapse of plants happens rapidly. Leaves remain green after wilting, until they are completely desiccated

Grey mould

rain, irrigation water) and nutrients for germination. Germination also happens at very high relative humidity (RH > 93%) on dry plants. The germ tube grows