Propargite phytotoxicity

Reduction of Propargite Phytotoxicity Through Spray Drying... 

PETERSON Reduction of Propargite Phytotoxicity Materials and Methcds... 

Table III is meant as a guide but does show that phytotoxlclty is dependent not just on plant species but also on the time of application. Young cotton has an unacceptable level of crop damage the same plants, treated later in the growing season, are much less sensitive. Citrus is listed as a sensitive crop because a very low level of phytotoxicity on the fruit Itself results in a reduction in quality and hence in the price paid for the fruit. This phenomenon has kept propargite fix)m sales on citrus in spite of its excellent activity against the mites found in citrus.

The acaricldal activity of propargite occurs primarily through vapor action, while the phytotoxic effects seem to arise only from direct contact with the plant leaf or fruiting body. Conceptually, therefore, a delivery system vdiich could prevent contact with the plant, yet allow the acaricldal vapor to escape, would prevent phytotoxicity and allow use on sensitive crops. 

The phytotoxicity and acarlcldal activity of this new formulation is shown in Table V. A commercial wettable powder formulation of propargite, Omlte 30W, was used for conparison purposes. 

Figure 3. Effect of shell weight on propargite efficacy and phytotoxicity...

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