Efficacy mixture of fomesafen and clomazone for weed control in potato

Abstract

In 2022–2023 in Leningrad region at potato Liga variety trials were conducted to evaluate mixture of herbicides Nexus (240 g/l of fomesafen) and Traser (480 g/l of clomazone) in the following schedules: 1.0 l/ha + 0.25 l/ha; 1.0 l/ha + 0.5 l/ha; 1.25 l/ha + 0.25 l/ha and 1.25 l/ha + 0.5 l/ha. The use of herbicides in their pure form acted as standard. The experiments were carried out in accordance with the methods of herbicide registration trials (2013; 2020). The use of tank-mix of herbicides Nexus + Traser made it possible to most fully control of mixed type of weediness, typical for the North-Western region. When applying a tank-mix herbicides in the regulations of 1.0…1.25 l/ha + 0.5 l/ha, the decrease in the weight of annual dicotyledonous weeds was at a level exceeding 75.0 %; the decrease in the weight of annual cereal weeds reached 88.3 %. The use of the herbicide Nexus in its pure form was most noticeably inferior to the application of tank-mix of herbicides Nexus + Traser (1.0…1.25 l/ha + 0.5 l/ha) in terms of effect on plants of barnyard grass (Echinochloa crusgalli (L.) Beauv.)) and baconweed (Chenopodium album L.). The main advantage of a tank-mix of herbicides over the herbicide Traser in its pure form was realized in relation to the effect on pale persicaria (Polygonum lapathifolium L.). Reduced competition from weeds contributed to the preservation of potato yields of Liga variety cultivated in the North-Western region. Under normal moisture conditions, the potato yield after using a tank-mix of herbicides Nexus and Traser (31.0…35.8 t/ha) significantly exceeded the crop yield after using these herbicides in their pure form (17.5…23.3 t/ha).