Abstract
<b> </b><b> </b>Evaluation the efficacy of bio-agents, application as foliar spray against vegetables foliar diseases incidence was carried out in open greenhouse conditions. The tested bio-agents were <i>Trichoderma</i> <i>harzianum</i>, <i>T</i>. <i>Viride, </i><i>Bacillus subtilis, Pseudomonas </i><i>fluorescens</i><i> </i>and <i>Saccharomyces </i><i>cerevisiae</i> were evaluated. The recorded foliar diseases, <i>i.e</i>. Powdery, Downy mildews of Cucumber, Cantaloupe and Pepper as well as Early, Late blights of Tomato were significantly reduced at all treatments either alone or in combinations comparing with untreated plants. Application with either <i>T. harzianum</i> and <i>B. subtilis</i> showed significant reduction in diseases incidence comparing with the other applied bio-agents. The other bio-agent treatments, <i>T. viride, P. </i><i>fluorescens</i> and <i>S. </i><i>cerevisiae</i> recorded moderate reduction in this concern. On the light of the present study it could be suggested that the usage of bio-agents might be used as easily applied, safely and cost effective control methods against such foliar plant diseases.
Highlights
Vegetable crops grown under protected cultivation, which considered as Egypt’s largest export national inco me, facing a serious problem due to diseases infection that cause about 20-30 % loss of produced yield because of favourable environ ment for disease incidence and development
Presented data revealed that Powdery and Downy mildews were d etected only on Cucumber, Cantaloupe and Pepper while Early and Late blights were recorded on Tomato plants
The recorded percentage of Powdery mildew in b io-agents spray application ranged between 13.3-33.3% in Cucu mber, 13.3-30.0% in Cantaloupe and 16.6-33.3% in Pepper comparing with 50.0, 43.3 and 40.0% in control treat ment, respectively
Summary
Vegetable crops grown under protected cultivation, which considered as Egypt’s largest export national inco me, facing a serious problem due to diseases infection that cause about 20-30 % loss of produced yield because of favourable environ ment for disease incidence and development. On the other hand,[13] reported that based on the whole plant tests, foliar spray with Paenibacillus macerans-GC subgroup A, Serratia plymuthica, Bacillus coagulans, Serratia marcescens-GC subgroup A, Bacillus pumilis -GC subgroup B and Pantoea agglomerans bacterial isolates reduced the disease severity of early b light significantly when co mpared with control. These results suggest that the bacterial isolates studied have a good potential to be used as biocontrol agents of A. solani in tomato. Pepper and Early, Late blights of Tomato under open greenhouse conditions
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