ASSOCIATION OF BOTRYOSPHAERIACEAE AND PHAEOACREMONIUM SPECIES WITH INSECTDAMAGED QUINCE SHOOTS
H. Mohammadi, S. Sharifi
During a study of fungal flora associated with fruit trees decline in Lorestan province (Iran), 54 isolates of Phaeoacremonium and Botryosphaeriaceae were obtained from symptomatic wood, borer holes, larvae of the beetles associated with the insect-damaged shoots and adult of beetles around the affected quince (Cydonia oblonga) trees showing leaf chlorosis, canker, dieback or decline symptoms. Based on morphological and molecular studies isolates were identified as Diplodia seriata, Dothiorella sarmentorum, Lasiodiplodia theobromae, Phaeoacremonium alvesii, P. mortoniae, P. parasiticum and P. viticola. Phaeoacremonium parasiticum, the most common species, was successfully isolated from discolored woody tissues, borer holes and larvae and adult beetles, while P. viticola was obtained from discolored woody tissues, borer holes and larvae, but not from adult beetles. Phaeoacremonium alvesii and P. mortoniae were only isolated from discolored woody tissues and borer holes, respectively. Dothiorella sarmentorum was obtained from discolored tissues, borer holes and adult beetles and D. seriata and L. theobromae were obtained from borer holes and discolored tissues. A pathogenicity test was conducted on detached shoots of quince with 1-5 isolates for each species. Lasiodiplodia theobromae produced significantly longer lesions than the other species, whereas D. seriata caused the smallest lesions 35 days after inoculation. This study represents the first report on the occurrence and pathogenicity of P. viticola, P. alvesii, L. theobromae and D. sarmentorum on quince trees. This is also the first report of isolation of P. parasiticum, P. viticola and D. sarmentorum from beetles.