Clavibacter michiganensis (Corynebacterium michiganensis) Bacterial canker of tomato General Clavibacter is a quarantine organism in Europe, which means that strong efforts are used to prevent the bac
Pythium ultimum Black leg of seedlings General Pythium is considered a ‘weak pathogen’, meaning that it can usually only affect plants that are in a sub-optimal condition or suffer from stress, caused
Sclerotinia sclerotiorum Cottony soft rot General Sclerotinia sclerotiorum, also known as cottony soft root, is a plant pathogenic fungus. It has a very wide range of host plants. Life cycle and appea
Alternaria solani Early blight General The only known stage in all Alternaria species is the asexual stage. Conidia and mycelium overwinter in the soil and on crop residues and cause primary infection
Hemiptera Psyllids
Fannia spp. Lesser house fly General The genus Fannia comprises almost 300 different species of fly, including the lesser house fly , the latrine fly and a whole host of other manure-breeding flies .
General The rice root aphid (Rhopalosiphum rufiabdominale) is a well-known pest in North America that survives outdoors all year round. It can affect plants grown in both soil and hydroponic systems.
and appearance of the Cannabis aphid Adult cannabis aphids are between 1.8–2.7 mm long. They are normally wingless but a winged form appears in late summer
Liriomyza bryoniae Tomato leaf miner General The tomato leaf miner (Liriomyza bryoniae) has many host plants and has caused crop damage in many parts of the world, including North Africa, Europe and n