كنترل شيميايي سس در مزارع چغندرقند و ارزيابي اثرات سوء آن بر گندم در تناوب

Chemical Control of Dodder (Cuscuta compestris) in Sugar Beet and Evaluation of the Phytotoxicity Effects on Wheat in Rotation

An experiment was conducted to determine the correct way of chemical control to the dodder in sugar beet in Miandoab Agricultural Research Station in 1998. A factorial experiment in completely randomized block design with four replications was used, in which, factor (A) was the type of the herbicide in three levels containing : Trifluralin al, Propyzamid a2, Ethofomisate a3; factor (B) was the dosage of the herbicide in three levels containing : 0.8 kg ai hat b1, 1.2 kg ai haʹ1 b2, 1.6 kg ai ha-1 b3, with two positive & negative checks.Results indicated that dodder weed decreased root yield and the percent of sugar by 30% and 2.13% respectively as compared with uncontaminated check. The herbicide of Trifluralin decreased numbers of grown bushes, yield rate and percent of sugar at most in order of : 53%, 35% and 2.9% respectively as compared with uncontaminated check and also decreased contamination of dodder just 23% and it hadnʹt any phytotoxicity effects in rotation with wheat. -Propyzamid decreased the parasitical plant of dodder at most to 87% as compared with complete contaminated check and increased the yield in three levels in order of : 29%, 30.71% and 35.22% as compared with complete contaminated check and also increased the percent of sugar as compared with complete contaminated check in the three levels in order of : 1.17%, 1.44% and 1.52% and it did not show any phytotoxicity effects on wheat rotation. Ethofomisate decreased just 19% of dodder contamination and also increased root yield of sugar beet in three levels of : 24.5%, 29.3% and 28.31% as compared with uncontaminated check and increased the percent of sugar in three levels in order of : 1.05%, 1.69% and 2.44% as compared with uncontaminated check. Ethofomisate also did not show phytotoxicity effects on wheat rotation.