General Ustilago nuda f.sp. tritici is a basidiomyceteous fungus that affects wheat. It is also known as loose wheat smut, or loose smut of wheat. Damage symptoms Infection by Ustilago nuda f.sp. trit
General Clavibacter is a quarantine organism in Europe, which means that strong efforts are used to prevent the bacterium from entering. When the occasional infection is found, strict measures are tak
What is apple rust mite? Apple rust mite (Aculus schlechtendali) is a microscopic eriophyid mite that feeds on the leaves and developing fruit of apple trees. Because of its small size, the pest is di
What is apple sawfly? Apple sawfly (Hoplocampa testudinea) is an important early-season pest of apple orchards. Adult sawflies emerge during flowering and lay their eggs in apple blossoms. After hatch
What is San José scale? San José scale (Comstockaspis perniciosa) is one of the most economically important scale insects affecting apple and pear orchards. Both nymphs and adult females feed by inser
What is pear rust mite? The pear rust mite (Epitrimerus pyri) is a microscopic, elongated, wedge-shaped eriophyid mite that feeds on leaves, shoots, and developing fruit in pear orchards. Unlike commo
What is apple blossom weevil? The apple blossom weevil (Anthonomus pomorum) is an important early-season pest of apple orchards. Adult weevils emerge before flowering and feed on developing buds befor
What is pear blossom weevil? The pear blossom weevil (Anthonomus piri) is a destructive pest of pear orchards. Adult weevils emerge from summer dormancy in autumn to lay eggs inside developing flower
What is green apple aphid? The green apple aphid (Aphis pomi) is a common aphid species in apple orchards. Both nymphs and adults feed on young leaves and shoots, reducing tree vigor and affecting sho
What is pear aphid? The pear aphid (Dysaphis pyri) is a highly damaging pest of pear orchards. Both nymphs and adults feed on developing foliage, causing leaves to curl and distort while reducing tree
