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During a study leave in 1978 the author spent about 40 percent of his time studying and observing closed mixing systems for pesticides as they were being used in California. The systems basically carried out four operations—penetration of the container, removal of the pesticide, metering out of the proper amount of pesticide, and transference to the mix tank without exposure of the operator. The systems observed were generally too complex, lacked durability, took too much time to carry out the operation, and were expensive. The probes used to penetrate the pesticide container and to remove the pesticide appeared to be a major problem. The author believes that closed mixing systems have promise and can contribute significantly to the safe use of pesticides. They should be easy to use and should be used for transferring all pesticides not just “restricted” pesticides. To accomplish this goal, and to gain general acceptance, the systems should be simple, durable, fast, and vacuum operated. All pesticide containers should have standardized closures and design to permit both removal of pesticide and rinsing of the can, and durable, lightweight probes with a “breakaway head.”
pesticide application, closed mixing systems, safety, tank mix applications, pesticides
Professor, Cornell University, Ithaca, N.Y.