|Authors: ||H.L. Pedersen, T.B. Toldam-Andersen|
|Keywords: ||Ribes nigrum, Spaerotheca mors-uvae, leaf damage, bud quality, source-sink, yield components|
In summer 1999 a field trails was established with the black currant variety ‘Ben Lomond’ to determine the level of infections from American gooseberry mildew (Spaerotheca mors-uvae) which black currant can tolerate without a decrease in yield, in Denmark.
In 2001 and 2002 four infection levels were established using different spraying intensities: A full spraying program, unsprayed and two in-between levels, where the first and the two first spays were omitted, respectively.
The development of mildew infection was followed.
Yield, internal berry quality and bud quality were determined.
Total control of infections of American gooseberry infections is difficult, especially in young bushes.
There was no effect of mildew infection on yield the actual year the infection occurred.
However, mildew infections reduced the yield the following year due to a poor bud quality especially on side shoots.
A reduced mildew control in the beginning of the season did not decrease the yield compared to a full pesticide program in the actual or the following year even the mildew infections increased to an intermediate level between a full pesticide program and unsprayed bushes.
At severe infection levels effects of decreased source strength may be exerted on sinks of low priority, such as flower buds.
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