Pea blight, leaf and pod spot

) causes foot rot in peas, whereas Ascochyta pisi does occur sometimes at the stem base but is not part of the foot rot syndrome in peas. Infected seeds [...] blight or pea blight) and lesions of stems, leaves, and pods (pea leaf spot and pea pod spot). Life cycle and appearance of Pea blight, leaf and pod spot Ascochyta [...] Ascochyta pisi hardly survives in the soil or on crop residues because of its poor saprophytic competitiveness and because chlamydospores are rare. Primary

Phytophthora blight

optimal for crop growth. Phytophthora overwinters in roots, infected tubers and bulbs or in the soil in different stages: as oospores (sexual overwintering [...] late blight tomato, potato blight and late / early blight of potato. Life cycle and appearance of Phytophthora blight Phytophthora species are very destructive [...] water. Infection is usually from the root to the foot, but direct infection of the foot also occurs. Exudates leaking from growing root tips promote germination

Pine processionary moth

during the following summer because of the persistence of allergenic hairs in the remains of winter nests The larvae of the Pine processionary moth cause [...] black. Pupation takes place in the soil in an oval, ochreous-white silken cocoon. The pupae are about 20 mm in length, oval, and of a pale brownish-yellow colour [...] pines. Life cycle and appearance of Pine processionary moth The female moth has a wingspan of 36-49 mm; the wingspan of the male is 31-39 mm. Both sexes

Citrus mealybug

an adequate intake of protein, mealybugs must therefore ingest large quantities of sap, getting rid of the excess sugars in the form of honeydew. Charac [...] many and diverse host plants. In temperate regions of the world this mealybug poses a problem in greenhouse horticulture, and in the tropics and sub-tropics [...] can also appear in cucumber, melon and aubergine. Life cycle of mealybugs Life cycle and appearance of Citrus mealybug Adult females of Planococcus citri

Leaf stripe

stripe Produce seed in semi-arid environments without irrigation, to decrease the chances of infection Use clean seed Avoid the use of untreated farm-saved [...] General Pyrenophora graminea is a disease of Barley that causes significant yield losses. Life cycle and appearance of Leaf stripe Pyrenophora graminea is [...] the base of the leaf and the leaf sheath. They gradually extend and become brown and chlorotic and may merge. Eventually this leads to the death of the leaf

Horse-chestnut leaf miner

horse-chestnut leaf miner overwinters in the pupal stage in a cocoon in dead leaves. The emergence of adults in spring occurs in April and May, depending on climatic [...] stands of the European horse-chestnut in Greece, Albania and Macedonia. It was first observed attacking ornamental horse-chestnut trees in Macedonia in the [...] spread to most of Europe. Since then, in all invaded regions, outbreaks have continued unabated, causing aesthetic damage to horse-chestnut, one of the favourite

Yellow rose aphid

holocyclic in North America (i.e. they mate in autumn and produce eggs to overwinter). It is also holocyclic in parts of Europe, whereas throughout most of the [...] probably of North American origin but is now widely distributed in Europe, North Africa, parts of Asia and South America. It attacks plants of the family [...] new generation of females) and generally found only on cultivated roses and strawberries, in glasshouses in northern Europe or outdoors in warmer climates

Long-tailed mealybug

sap is rich in sugars, but low in proteins. In order to gain an adequate intake of protein, mealybugs must therefore ingest large quantities of sap, getting [...] length of the body itself. The length of the other filaments is roughly half the width of the body. The female is 3 - 4 mm long. Reproduction in Pseudococcus [...] the reduced level of photosynthesis in the leaves also reduces flower and fruit production. In ornamental crops, the mere presence of mealybugs is sufficient

Southern European marshland pyralid

seen in the daytime. Eggs are laid singly or in groups of 5 to 10 eggs, overlapping in a tile-like fashion on both the upper and lower surface of leaves [...] are 4 pairs of prolegs. Caterpillars are found in webs, preferably in damp, humid places and are thus mainly found low in the crop, often in decaying organic [...] pupate in an earthen cocoon, concealed either within the crop or in another suitable spot in the vicinity. Pupation occurs in a cocoon made of webbing

Impatiens thrips

spread as a consequence of the trade in foliage plants. Impatiens thrips (Echinothrips americanus) has a wide range of hosts. In addition to many ornamental [...] leaves and the black dots of their excreta indicate their presence in the crop. The vigour of the plant is reduced by loss of chlorophyll. When infestations [...] americanus is often found low in the crop. In sweet pepper the damage can be seen as discolouration of older leaves at the bottom of the plant. Solution Finder