Abstract
IN recent years, losses in glasshouse tomato crops caused by Botrytis cinerea Pers. have become serious in New Zealand. This is particularly true of crops treated with fruit-setting hormones, where the dead petals are retained at the calyx end as the fruit expands. These dried petals provide entry points for infection of the fruits. Heavily sporulating centres of infection thus develop early in the life of the crops, increasing the likelihood of later epiphytotic development of all phases of the disease. This is a frequent occurrence in crops treated with hormones. Some form of protection for these petals is desirable, therefore, to reduce loss of fruit and prevent early build-up of infection.
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