Determination of the amount of scab primary inoculum by PAD method in integrated and organic apple orchards
2002
Holb, I.
In this study we determined the amount of apple scab primary inoculum in integrated and organic apple orchards using the PAD (potential ascospore dose) method. With the help of the PAD method one can quantify the potential amount of primary inoculum (ascospores) per m2 area of the apple orchard. Applying this method, we determined the number of scab lesions on 1 m2 leaf surface in the autumn (LD), the percentage of leaf litter density in the spring (LLD) and potential ascospore dose (PAD) as a function of the previous two values. In autumn LD values ranged between 1.6 and 13.5 in the integrated orchards, while in the organic orchards the values were between 19.4 and 97.5 with especially high values in the Dutch organic orchard.
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