• Laeveld_Agrochem_GROEI_20_-_Winter_2022.pdf

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• Pear brown spot

  What is pear brown spot? Pear brown spot is a destructive fungal disease caused by Stemphylium vesicarium . The disease affects leaves, shoots, and fruit, reducing fruit quality, marketable yield, and

• Apple scab

  What is apple scab? Apple scab is one of the most economically important fungal diseases of apple worldwide. Caused by the fungus Venturia inaequalis , the disease infects leaves, blossoms, young shoo

• Apple rust mite

  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

• Apple sawfly

  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

• San José scale

  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

• Pear rust mite

  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

• Apple blossom weevil

  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

• Pear blossom weevil

  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

• Green apple aphid

  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