Herbicide Use and Other Weed Management Practices. Weed control practices included use of herbicides, cultivation and use of rotary hoe. KS respondents used spring-applied Prowl on 45% of their acres, followed by spring-applied trifluralin on 14% of their acres (Table 29). These use figures are similar to 1994 (4).

MN respondents used Assert on 28% of their acres, followed by spring-applied Prowl on 24%, spring-applied Sonalan on 22%, Poast on 20% and spring-applied trifluralin on 15% (Table 29). These data represent a shift to considerably less use of trifluralin than in 1994 and to a slight increase in Prowl use (4).

ND respondents used spring-applied Sonalan on 43% of their acres and spring-applied trifluralin on 31% (Table 29). These data are similar to those for 1994 (4).

SD respondents used spring-applied trifluralin on 31% of their acres, followed by spring-applied Sonalan on 29%, Poast on 14% and spring-applied Prowl on 13% (Table 29). These data represent a shift since 1994 with less use of trifluralin and greater use of other dinitroanaline herbicides and a slight increase in the use of Poast (4).

Desiccant use was minimal in all four states (Table 30). KS and MN respondents used desiccant on 2% of their acres. ND and SD respondents used desiccant on less than 1% of their acres.

Most respondents used a single herbicide application. Only a few respondents in ND and SD used two applications (Table 31). Over 90% of respondents in all four states reported that herbicide application was by ground (Table 32).

Grass weeds were the targeted weeds by 34% of KS, 50% of MN, 56% of ND and 62% of SD respondents. Broadleaf weeds were the targeted weeds by 19% of KS, 27% of MN, 12% of ND and 3% of SD respondents. Grass and broadleaf weeds were the targeted weeds by 47% of KS, 23% of MN, 30% of ND and 32% of SD respondents (Table 33).