Year: 1987
Type: article
Abstract: The efficacy of fungicides and the optimum time of application were evaluated in spray programmes for control of botrytis fruit rot (caused by Botrytis cinerea Pers.: Fr.) in export boysenberries ( Rubus hybrid). All fungicides tested controlled the disease, with dicarboximides (iprodione, myclozolin, procymidone, vinclozolin) and dichlofluanid being more effective than captan, thiram, or folpet. Avoiding dicarboximide sprays after 10% blossom (two applications of dicarboximide before 10% blossom), followed by folpet until mid harvest resulted in slightly more berry rot than a full dicarboximide programme (9 applications), but did not reduce marketable yield: therefore, a reduced use of dicarboximides is recommended to avoid problems associated with the resistant strains of B . cinerea identified in New Zealand. Degradation of dicarboximide residues on fruit after programmes of 9 applications followed first‐order kinetics with calculated half‐lives of 10–12 days for iprodione, 9 days for procymidone, 7 days for vinclozolin, and 5.5 days for myclozolin. These decay rates are discussed in relation to residue restrictions imposed by countries importing New Zealand boysenberries.
Authors: L. H. Cheah, K. G. Tate, P. T. Holland
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2063629439