Significance of leaf infection by Botrytis cinerea in stem rotting of tomatoes grown in non-heated greenhouses

摘要: The most serious symptom of Botrytis cinerea in tomatoes grown greenhouses is stem rotting. Lesions on the may result from direct infection or progression rot along infected leaves, until approaches stem. In a set experiments conducted commercial greenhouses, an experimental greenhouse and growth chambers, significance two types infections was studied. non-heated lesions originated pathogen petioles. rate at which B. had progressed petioles 0.3–0.5 cm/day, average ca. 6 weeks needed for leaf to approach Application Trichoderma harzianum T39 extended this time by 1–2 application chemical fungicides 3 weeks. Influence environment then determined. Within range 5–30 °C, higher temperature, more rapid disease progression. fungus rapidly tomato incubated high vapour pressure deficit (VPD) rather than low VPD. source-sink relationship plant governed as well: it when source restricted (by shading) slower sink removal flowers small fruits). possibility that sanitation leaflets would reduce incidence rotting examined experiments. plots not treated with fungicide, treatment substantially decreased effective weekly fungicides.