Failure to do so limits the production of squash on a commercial scale. Aircraft or ground application is used, but the latter is preferred because of superior coverage, especially of the lower surfaces of leaves. The method of application is as important as the choice of material if adequate results are to be achieved. At this speed an observer should be able to walk behind the tractor at a comfortable pace. When these calibration guidelines are followed, most disease problems should be adequately controlled on a 5-7 day spray schedule.
Thorough coverage is absolutely essential.
Addition of drop nozzles will enhance coverage of larger plants, especially the lower surfaces of leaves. Timing of applications is very important. If fungicides are applied after a disease is first found in a field, it may be impossible to prevent serious losses from occurring. It also provides some control of powdery mildew. Powdery mildew control may require additional fungicide applications aimed specifically at this disease.