ISHS Acta Horticulturae 808: II International Symposium on Tomato Diseases
COMPARATIVE EPIDEMICS OF BLACK LEAF MOLD (PSEUDOCERCOSPORA FULIGENA) AND EARLY BLIGHT (ALTERNARIA SOLANI) ON TOMATO (SOLANUM LYCOPERSICUM) CULTIVATED IN FOUR DIFFERENT GREENHOUSE SETUPS IN THAILAND |
| Authors: | Z. Mersha, B. Hau |
| Keywords: | Black leaf mold, epidemics, greenhouse, cooling methods, favourability index |
| Abstract:
Epidemics of the two major foliar fungal diseases under protected cultivation, namely black leaf mold (Pseudocercospora fuligena) and early blight (Alternaria solani), were compared in four greenhouses with different cooling methods located in the campus of the Asian Institute of Technology. The cooling methods were use of fan and pad (FAD), 50-mesh (BioNetTM) and 78-mesh (Econet-TTM) natural ventilation (NV), and NV plus shading a nearly infrared pigment on the roof of a 78-mesh green¬house (Econir). Severity of both diseases (DSTOT), i.e. black leaf mold (DSBLM) and early blight (DSEB) together, was positively correlated to increased cooling and relative humidity (RH). Cooling of the FAD greenhouse was accompanied by high RH which unabatedly created a fertile ground for epidemics of both diseases. Accordingly, there was 50 to 94% and 54 to 61% more of these diseases in the FAD greenhouse during the hot-wet and cool-dry seasons, respectively as compared to the other three. Next to FAD were Econir and BioNetTM whereby the average seasonal temperature was 1 to 2°C higher and RH 10 to 20% less than in FAD. The lowest disease was observed in Econet-TTM where temperature was highest at noontime. During the cool-dry season, DSEB was dominant in the FAD greenhouse, comprising 68.9% of the total AUDPC. | |
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