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Title

CHEMICAL CONTROL OF POWDERY MILDEW DISEASE IN SUGAR BEET CROP

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Abstract

 IN ORDER TO STUDY ON THE EFFECT OF CHEMICAL CONTROL OF POWDERY MILDEW ON ROOT YIELD AND QUALITY OF SUGAR BEET SOME EXPERIMENTS WERE CONDUCTED. IN THESE EXPERIMENTS THE EFFECT OF 4 CHEMICAL TREATMENTS OF THE FUNGICIDE CALIXIN ALONG WITH CONTROL WITHOUT SPRAYING, ON 3 COMMERCIAL CULTIVARS OF SUGAR BEET IN A SPLIT PLOT EXPERIMENT UNDER THE PATTERN OF COMPLETELY RANDOMIZED BLOCK DESIGN WITH 4 REPLICATIONS DURING TWO YEARS AND IN TWO REGIONS WERE INVESTIGATED. CHEMICAL TREATMENTS AND CULTIVARS CONSIDERED AS MAJOR AND MINOR PLOTS RESPECTIVELY. COMBINED ANALYSIS DURING TWO YEARS IN TWO REGIONS INDICATED THAT DISEASE SEVERITY IN SPRAYED TREATMENTS WAS LOWER THAN CONTROL TREATMENT AND WITH INCREASING IN THE NUMBER OF SPRAYINGS INFECTION DECREASED. LOWEST DISEASE RATE REGISTERED AS 22.24% IN THE TREATMENT WITH 4 TIMES OF SPRAYING AND HIGHEST DISEASE RATE WAS SCORED IN THE CONTROL TREATMENT WITH 43.39% OF INFECTION. ROOT YIELD IN THE CONTROL TREATMENT WITH 63.49 TON/HEC WAS LOWEST AND THE 4 TIMES SPRAYING TREATMENT HAD THE HIGHEST ROOT YIELD. ONE TIME SPRAYING LIFTED ROOT YIELD UP TO 2.8 TON/HEC AND CHEMICAL TREATMENT WITH 4 TIMES SPRAYING RESULTED IN INCREASING OF 5.8 TON/HEC OF ROOT YIELD. VARIATION IN SUGAR CONTENT WITHIN THE TREATMENTS DID NOT FOLLOW A REGULAR TREND AND THE CULTIVARS DID NOT SHOW A SIGNIFICANT DIFFERENCE FOR REACTION TO POWDERY MILDEW.

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