Effect of some host and microclimate factors on infection of tomato stems by Botrytis cinerea

被引:72
作者
ONeill, TM
Shtienberg, D
Elad, Y
机构
[1] AGR RES ORG,VOLCANI CTR,DEPT PLANT PATHOL,IL-50250 BET DAGAN,ISRAEL
[2] ADAS HORT,CAMBRIDGE CB2 2BL,ENGLAND
关键词
gray mold; Lycopersicon esculentum; wound infection;
D O I
10.1094/PDIS.1997.81.1.36
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The susceptibility of tomato stems to infection by Botrytis cinerea and the influence of temperature and humidity on disease development were investigated with stem pieces and whole plants. Stem rotting resulted after inoculation of wounded stems with a conidial suspension in water or with dry conidia; no symptoms developed following inoculation of unwounded stems. The proportion of inoculated stems developing Botrytis rot increased as the inoculum concentration was increased from 10 to 10,000 conidia per stem. Stem susceptibility to infection de dined from 60 to 8% as wound age increased from 0 to 24 h before inoculation. Wounded stem pieces maintained in a low vapor pressure deficit (VPD) environment (<0.2 kPa) remained susceptible for a longer period than those maintained at a high VPD. Infection and stem rotting occurred at temperatures of 5 to 26 degrees C, with disease development most rapid at 15 degrees C. Sporulation was optimal at 15 degrees C and did not occur within 20 days of incubation at 5 or 26 degrees C. Incubation at high humidity following inoculation of fresh wounds (VPD <0.2 kPa) did not increase infection incidence or tissue rotting, compared with incubation at a VPD >1.3 kPa; however, incubation at the lower VPD did increase the intensity of sporulation.
引用
收藏
页码:36 / 40
页数:5
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