Listed below are the uses for each of these supplementary materials. Phosmet may be used in place of both malathion and methoxychlor for general insect control. Benomyl, chlorothalonil or thiophanatemethyl may be used in place of captan for brown rot control. 2 Do not use chlorothalonil after shuck-split. Only use the Daconil 2787 formulation labeled for fruit crops.
Black knot appears as conspicuous black elongated galls on the twigs and branches.
Twigs and branches may be killed when galls grow completely around them. Black knot can be controlled by a combination of pruning and spraying, but these measures must be continued each year until no new knots appear. Prune out knots during the dormant season. Make cuts four to six inches below the first sign of visible swellings. Thiophanate-methyl has proven most effective for black knot control.