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In order to explore the control measures of malignant weeds and ryegrass in wheat field, the researchers of Henan Academy of Agricultural Sciences Institute of Plant Protection passed the laboratory test to determine the inhibitory activity of flufenacet and pendimethalin on wheat and ryegrass.
The liquid culture method showed that the medium dose (ED50) of flufenacet and pendimethalin on the growth inhibition of ryegrass was 0.13 mg/L and 0.16 mg/L, respectively. The ED50 values ​​of flufenacet and pendimethalin were 1:1, 1:2, and 2:1, and the ED50 values ​​of ryegrass were 0.12 mg/L, 0.04 mg/L, and 0.24 mg/L. The coefficients (CTC) were 123.8, 346.7, and 59.8, respectively, indicating that flufenacet and pendimethalin were synergistically matched with 1:1 and 1:2 for the control of ryegrass, especially in the 1:2 mixture. Significant effect. The results of pot experiment showed that the combination of flufenacetamide: pendimethalin 1:2 was applied to the ryegrass and wheat at 3 days after sowing, 5 days after seedling and 15 days after seedling. The indexes were 1.15, 0.24, and 0.28, respectively, which indicated that the application of pre-emergence seedlings had the highest selectivity to ryegrass, and could control the occurrence and growth of ryegrass to some extent, and post-emergence application to ryegrass The selectivity is relatively poor.
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