First record of Pestalotia macrotricha as acusal of Rose leaf spot disease in Basrah and its integrated control

Abstract

This study was conducted in the laboratories of the Plant Protection Department / college of Agriculture / University of Basra during the period from 2015-2016. The survey results showed that Rose leaf spot diseases spread in all the nurseries surveyed, but the highest incidence rate and disease severity were recorded in Khurh nurseries ( 62.3% and 53.3%) respectively, and the lowest incidence and disease severity in Zubair nurseries( 21.6% and 23.3%) respectively . Isolation results showed the presence of fungus Diplocarpon rosa with the fungus Pestalotia macrotricha from most infected leave samples. The pathogenicity testing results showed the ability of the fungus P. macrotricha to cause leaf spot. In addition the results of pesticide testing showed that pesticide Dazim and Revous Top were the most inhibitory of the growth of fungus Pestalotia macrotricha were the percent of inhibition was 100% compared to 55% of the pesticide Hunter. The results also showed the ability of the Chaetomium globosum and Psedomonas fluorescens bacteria in inhibition the growth of Pestalotia macrotricha. The results also showed that the plant extract (Quercetin), which derived from a number of plants such as onions and apples, was most effective in inhibition of the growth of P. macrotricha compared with Silibnin extract which was extracted from Sylibum marianum.