Articles
FORECASTING ASCOSPORE DOSE OF VENTURIA INAEQUALIS AS AN AID TO CONTROL OF PRIMARY SCAB IN COMMERCIAL APPLE ORCHARDS
Article number
347_13
Pages
127 – 132
Language
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.
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.
Authors
H.A.Th. van der Scheer
Keywords
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