Efficacy of certain fungicide alternatives for controlling sugar beet powdery mildew
In order to study the importance of selection of suitable sugar beet cultivars for growing in Upper Egypt, ten sugar beet cultivars were tested for their susceptibility to Erysiphe betae, the causal fungus of powdery mildew Among them, Sirona (453 AUPMPC; the Area Under Powdery Mildew Progress Curve) was significantly the most resistant cultivar to powdery mildew disease while, FD.0807 (1484 AUPMPC) was the most susceptible one. Field experiment was conducted to evaluate five plant extracts, three chemical antioxidants and four microelement compounds for their efficacy in controlling E. betae. Results confirmed that all tested treatments caused significant reduction in AUPMPC values when sugar beet plants were sprayed with these tested compounds and the increasing of the concentration increased resistance of sugar beet plants against powdery mildew disease. Among the tested plant extracts, the highest protection (69.9% & 66.9%) on both cultivars Sirona and FD.0807 respectively was achieved by 30% of basil extract followed by 30% of garlic extract (53% & 60.4%) while, the least protection (33.9% & 52.8%) was obtained by 10% of black cumin seed extract. Concerning the tested inducers, the highest protection (56.7% & 70.6%) was achieved by 300 ppm of salicylic acid followed by 200 ppm of salicylic acid (51% & 63.7%), while, 100 ppm of ascorbic acid gave the least protection (2.2% & 34.1%). On the other hand, 40 ppm of cupric sulfate achieved the best percentage of protection (72% &78.7%) whereas, the least protection (8%) was obtained by 10 ppm of zinc sulfate on Sirona cultivar and the least protection (43.6%) was obtained by 10 ppm of magnesium sulfate on FD.0807 cultivar. The best comparative treatment was the tested fungicide Bellis® 38% WG (89.5% &90% protection). Usage of plant extracts, antioxidants and micro elements are well recommended as fungicide alternatives for controlling the disease in parallel with their safe influence on human health due to reduction of the accumulated chemical hazards in the plant tissues.
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