Agriculturae Conspectus Scientificus, Vol 66, No 2 (2001)

Biology and Epidemiology of Apple Scab


Pages: 95-101


There are several types of fungi that are pathogenic to apples. The most important in Croatia is Venturia inaequalis (Cooke) Winter which causes the disease apple scab. Losses caused by V. Inaequalis is greater than all other damage together, including other fungi and pests. These losses include: (1) shrinking leaf surface, (2) weakening trees growth, (3) decrease in yield, (4) decrease in fruit quality and (5) increase cost of protection Infected leaf edges have poor assimilation due to an increase in transpiration by damaged cuticles. Loss of water from transpiration is more prevalent during the summer in arid conditions. Leaves that contain over 50% surface infection gradually begin to yellow and fall off during vegetation. For all these reasons, nutritive value is weakened, which influences crop yield and tree growth. Damage to the fruit itself is most significant, sometimes causing them to fall off and loss in yield can be between 56% - 74%. (Cvjetković et al. 1989, Jones and Aldwincle 1991).


apple scab; Venturia inaequalis

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