Powdery mildew

the leaf. In severe epidemics in cereals, the ears may also be infected. In pepper, the fluffy colonies occur mostly on the underside of the leaf, because [...] the epidemics. Fungal spores germinate on the leaf surface and the germ tubes grow and branch out on the leaf surface. Small structures are produced, the [...] entering through the stomata and there are more stomata on the underside of the leaf. On the upper side, yellow spots are noticeable. In case of a severe epidemic

Downy mildew of Cucurbits

leaves but occasionally also stems and fruits. They cause lesions on the upper leaf surface, bordered by the veins, which are first yellow and then turn brown [...] around 15 o C and the closer the temperature is to this, the shorter the leaf wetness period that is required. Inside the plant, the pathogens produce [...] from the stomata. Because there are more stomata on the underside of the leaf, this is where most fluffy symptoms are found. How to prevent Downey mildew

Grapevine powdery mildew

secondary infections, such as Botrytis bunch rot. Leaf symptoms Pale green to yellowish spots on the upper leaf surface Development of white to grey, powdery [...] fungal growth Powdery coating may also appear on the underside of leaves Leaf curling, distortion, and brittleness as infection progresses Reduced pho

Plant Health

system, stimulating the soil food web. This interaction releases essential minerals, enabling the formation of complete proteins crucial for plant growth.

Impatiens thrips

deposited in the leaf tissue, while subsequent stages are found on the upper- and undersides of the leaf. Pupation occurs on the leaf rather than on the [...] the ground. The prepupae and pupae remain immobile on the leaf tissue. Adults are found on both upper- and undersides of the leaves. This species of thrips

Broad mite

that disturb local growth. Leaf feeding is mainly concentrated on the underside near the leaf stalk, which tends to cause the leaf to turn brown and curl up [...] stand out as a green pattern against the brown leaf tissue. Brown, corky patches can appear on the leaf stalks and main stems. The growing tips of affected [...] Polyphagotarsonemus latus ) lay their eggs mainly on the underside of the leaf or on the fruit surface. The elongated, oval eggs are firmly attached to

Integrated Pest Management

minimal presence of soil borne pests or diseases, but also well-balanced minerals in the soil matrix or nutrient solution and a porous structure of soil

Tobacco whitefly

which growth is retarded. In full sunlight, leaves can wilt and fall. Such leaf damage can in turn influence the development of fruit and lead to a reduction [...] symptoms include the appearance of chlorotic patches, yellowing, fruit and leaf fall and misshapen fruit. Life cycle and appearance of Tobacco whitefly The [...] are mobile, whereas the rest of the larvae stadia remain flattened on the leaf. The fourth larva stadium develops into a yellow, almost circular so called

Hemp russet mite

mites can also be found on the underside of leaves. This results in smaller leaf size and suppressed bud growth leading to a reduction in the number of buds [...] of damage include dull, greyish, or bronzed leaves and upward curling of leaf edges. Life cycle and appearance of Hemp russet mite All life stages of the

Life cycle of Tomato leaf mining moth