This search carried out to study the effect of treatment with some fungicides
(mancozeb + metalaxyl - M, chlorothalonil ،azoxystrobin and mancozeb) in
control late blight (Phytophthora infestans Mont.) on potato va. Spunta and
yield in homs during
two seasons 2008 and 2009. The results showed that the
use of a mixture of fungicides (mancozeb + metalaxyl - M) gave the superior
efficacy in controlling the disease during two seasons compared with other
treatments. The percentage of effect (74.32% and 57.24%) during 2008 and
2009, respectively. While, the fungicides (mancozeb) gave the lowest effect in
controlling the disease during two seasons, where as the percentage of effect
(31.95% and 40%), respectively. Recorded results showed that spray of potato
plant with tested fungicides increase the yield compared with untreated plants.
The mixture fungicides (mancozeb + metalaxyl-M) increase in yield (35.55%
and 32.285) during 2008 and 2009, at respectively. We can arrange the tested
fungicides according to their the efficacy in controlling the disease and in
increase the yield such as following: mancozeb +metalaxyl-M> chlorothalonil>
azoxystrobin> mancozeb.
