ISHS Acta Horticulturae 347: II International Symposium on Integrated Fruit Production
FORECASTING ASCOSPORE DOSE OF VENTURIA INAEQUALIS AS AN AID TO CONTROL OF PRIMARY SCAB IN COMMERCIAL APPLE ORCHARDS |
| Author: | H.A.Th. van der Scheer |
| Abstract:
In 1990, 1991 and 1992 the primary inoculum of Venturia inaequalis - expressed as potential ascospore dose (PAD) - was evaluated as an aid to the control of primary scab in commercial apple orchards in The Netherlands. In most commercial orchards PAD is low and as a result the first early-season fungicide spray can be delayed for at least three weeks without causing crop loss. However, in a few orchards with a zero PAD no delay in spraying could be tolerated; this was probably due to infection from air-borne inoculum. This problem seriously limits the general use of PAD estimations as aids in a scab management programme. | |
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