ABSTRACT

Results leading to specific recommendations for the use of Topsin-M for the management of Fusarium hardlock are speculative at this time. However, based on interpretation of data from five states collected during 2003, tentative recommendations for the use of Topsin-M for management of Fusarium hardlock are as follows. 1) Apply Topsin-M at a rate of ½ lb (formulated product) per acre. 2) Begin applying fungicide at full bloom, i.e. when 25-50% of the cotton plants have their first bloom. 3) If a grower plans to make two fungicide applications, the second spray should be made 14 days after the initial spray. If a grower plans to make three fungicide applications, the fungicide sprays should be timed seven days apart. 4) Spray volumes and spray pressures should be adequate to insure penetration of the foliar canopy and complete coverage of open blooms. Further application strategies and information on fungicide resistance management should be available in the future.