Hebron University Research Journal-A (Natural Sciences) - (مجلة جامعة الخليل للبحوث- أ (العلوم الطبيعيه
Biological Control of Rhizoctonia by Indigenous Trichoderma spp. Isolates from Palestine
The effect of indigenous Trichoderma isolates against the soil-borne phyetopathogen Rhizoctonia solani was investigated in dual cultre and bioassay on bean plants .Application of the bioagent isolates as a conidial suspension( g soil 3*10^7)greatly reduced the disease index of bean plants caused by R.solani in different rates and the most effective Trichoderma harzianum isolate (Jn14) reduced the disease by 65%. In dual culture ,the T. harzianum (Jn14) overgrew the pathogen R.solani in an average of 16.75 mm/day at 30C .in addition, the results showed that T. harzianum (Jn14) and T. harzianum (T36)were the most effective isolates at 25C and inhibited R.solani mycelial growth by 42% and 78% respectively ,due to fungitoxic metabolites production . The Effect of TRICHODERMA on bean seedlings growth was obvious ;height was nearly doubled (160%-200%),while fresh and dry weights increased by 133%and 217% , respectively .Germination of bean seeds in treated soil with Trichoderma isolates occurred about four daye earlier than those in untreaed soils . the results revealed however some variation between isolates which was due to genetic variation ,mycelium –coiling rate ,sporulation rate , fungitoxic metabolites , induced response and temperature effect.
بركات, رضوان; المصري, محمد; المحاريق, فضل; and اشتيه, محمد
"Biological Control of Rhizoctonia by Indigenous Trichoderma spp. Isolates from Palestine,"
Hebron University Research Journal-A (Natural Sciences) - (مجلة جامعة الخليل للبحوث- أ (العلوم الطبيعيه: Vol. 3:
1, Article 2.
Available at: https://digitalcommons.aaru.edu.jo/hujr_a/vol3/iss1/2