EFFECT OF CAPTAFOL AND RIDOMIL (R) MZ IN THE CONTROL OF LATE BLIGHT (PHYTOPHTHORA INFESTANS) AND SEPTORIA LEAF SPOT (SEPTORIA LYCOPERSICI) ON TOMATO

Late blight (Phytophthora infestans) and septoria leaf spot (Septoria lycopersici) are the main limiting factors for growing tomatoes in the rainy season in Ethiopia.
Experiments conducted at Awassa and Melkasa showed that Captafol 80% WP at 0.3% concentration and Ridomil (R) Mz 63.5% WP at 0.27% separately and in combined form significantly reduced the incidence of late blight and septoria leaf spot.
At Melkasa from Captafol and Captafol plus Ridomil (R) sprayed plots 22.1 and 21.4 tons per hectare marketable fruit was obtained, respectively, compared to 13.3 tons from the control.
At Awassa 52.2 and 66.6 tons per hectare were obtained in the given order.
But with respect to cultural practice, staking has not significantly influenced the disease situation and yield.
However, there is a tendency of high disease pressure when staking was practiced.

Further investigation on the concentrations and spray interval of the combined form of these two fungicides indicated that 0.2% Captafol plus 0.23% Ridomil (R) sprayed at 7-day intervals was found to be the best combination both in reducing the incidence of the two important tomato diseases and increasing yield by 2 173.3% over the control.
With regard to the net return, the highest net return was obtained from the above mentioned ones as compared to the two earlier concentrations and the intervals used.

X African Symposium on Horticultural Crops

T. Tedla

https://doi.org/10.17660/ActaHortic.1985.158.45