Brown root rot, corky root rot

survives in the soil and in buried tomato roots as microsclerotia. The microsclerotia germinate and produce mycelium that in turn infect the roots of tomato [...] corky root rot. Damage symptoms The first signs of this disease, are poorly looking plants in localized areas of the greenhouse or field. The affected plants [...] more and more destruction of the root system and subsequent loss of vigour and further wilting. Life cycle and appearance of Brown root rot, corky root

Fusarium head blight or scab

ascospores. In general, most Fusarium specieshave a similar life cycle. Fusarium overwinters for many years in the soil and on crop residues of infected plants [...] plants Ensure there is adequate soil drainage Apply nitrogen in the form of nitrate instead of ammonium Prevent damage during harvest and during post-harvest [...] General Fusarium is a group of soil-borne fungi with many different species. Fusarium is widespread and can infect a range of host crops. Many species are

Dwarf bunt

appearance of Dwarf bunt Tilletia controversa survives as teliospores in the soil or on seed. The soil-borne teliospores are the main source of primary infection [...] y, these teliospores contaminate healthy kernels, which in turn become a source of disease in the next season. The optimum temperature for germination [...] plants only reach a fraction of their normal height. Spikes are generally broader and the glumes opened wider, than in plants infected with Tilletia tritici

Wheat bunt

kernels, which in turn become a source of disease in the next season. Infection is strongly correlated to temperature and precipitation in the first 11 days [...] appearance of Wheat bunt Tilletia tritici and Tilletia laevis survive as teliospores in the soil or on seed. These teliospores germinate in response to [...] types are distinguished. The filiform basidiospores fuse in the middle with a basidiospore of the other mating type so that H-shaped structures are formed

Cercospora leaf spot

humidity favours the spread of the disease and severity. The fungus has the ability to overwinter in plant debris and remains in the field for long time. [...] many species of Cercospora species depending on the plant type infected. Infected seeds, infected plants and plant debris are primary source of infection [...] the rate 1.25 to 1.5 ml per litre of water at 12-15 days intervals as preventative spray and or after recognition of the disease symptoms. Symptoms Leaf

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 [...] reduction of photosynthesis and therefore the yield. Flowers and fruit often drop off. Plant sap is rich in sugars, but low in proteins. In order to gain

Crane flies

General The larvae of crane flies , called leatherjackets, live in the soil and feed on roots and shoots (which they pull into the ground of mainly grasses [...] symptoms Larval feeding causes brown spots in grasslands, turf and cereal fields. Exit holes of the burrows of the larvae might also be visible. Secondary [...] during the autumn.. Larvae overwinter in the soil, usually in the third instar stage. and start feeding again in spring. They become active again and feed

Western flower thrips

insect. The eggs of the western flower thrips (Frankliniella occidentalis) are laid in leaves, flower petals and in the soft parts of stalks. They are [...] 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 [...] (Frankliniella occidentalis) usually pupate in the ground, although pupae can also be found on leaves, in flowers or in other sheltered places. The prepupal and

Glasshouse potato aphid

presence in the crop. The wingless adult stage of the greenhouse potato aphid is rather squat, of medium size (1.8 - 3.0 mm long) and oval in shape. It [...] alternation of hosts, and the two types of life cycles occur on the same host plant. The aphid can overwinter not only in greenhouses, but also outdoors in sheltered [...] Aulacorthum solani) is a native European species of aphids , seriously affecting crops of sweet pepper in particular. These aphids further affect ornamental

Tobacco whitefly

transmission of viruses, including TYLCV in tomato. The consumption of plant sap and secreting of honeydew by whiteflies reduce the aesthetic value of crops. [...] irregular ripening in tomatoes and sweet peppers, yellowing of the flower stalks in gerbera, and serious yellowing of the leaves of French beans. Other [...] identified on tobacco in Greece in 1889, hence the name tabaci . It has subsequently been found in most tropical and subtropical countries of the world. The original