• Pear psylla

  malformation of leaves and fruits. Heavy infestations can cause premature leaf fall and fruit drop. Flowers attacked by first generation nymphs turn brown

• Two-spotted spider mite

  sap is removed, the leaf, and eventually the whole plant, may die. In tomatoes and cucumbers, as little as 30% damage of the leaf surface can lead to loss

• Verticillium wilt

  occur on the stem. In tomato, sometimes V-shaped lesions are formed on the leaf, between the veins. 'Early dying' disease of potato only occurs as premature

• Wheat bunt

  tritici and Triticum laevis . Since Triticum controversa mostly attacks the 2-3 leaf stage, this is less effective for this fungus Prevent plant diseases by

• Fusarium head blight or scab

  symptoms Fusarium fungi cause vascular wilt, root rot, foot and stem rot, leaf lesions, fruit rot, fusarium head blight in cereals, such as wheat (fusarium

• European red mite

  European red mite feeds mainly on the undersides of leaves but moves to upper leaf surfaces when the lower side becomes crowded. Contrary to the two-spotted

• Circular scale

  to fruits, stems and trunks, and may cause yellowing of leaves, premature leaf and fruit drop, and stem dieback. First signs of an infestation are dark-purple

• Phytophthora blight

  zoospores produced in the sporangia. For germination on above-ground plant parts, leaf wetness is required. Dispersal is by wind and rain causes the pathogen to

• Apple rosy aphid

  Attacked shoots are stunted and twisted. Heavy attack can lead to premature leaf fall and death of shoots. Fruits from infested trusses are small and malformed

• Onion thrips

  can shrivel. Onion thrips (Thrips tabaci) is found mostly along the main leaf veins, with most damage evident where these veins join. Fruit damage, for