HERBICIDES IN CULTIVATION OF MILK THISTLE
Background. Milk thistle is a species that can be used not only for medical and nutritional purposes, but also in other branches of the economy. Under field conditions this plant is easily infested with weeds. The aim of the study was to test the effectiveness of selected herbicides during milk thistle cultivation, with particular emphasis on foliar preparations for control of dicotyledonous weeds.
Material and methods. In a two-year field study (2016, 2017) conducted at the MocheĹ‚ek Research Station, under favourable humidity conditions, the following were tested: (1) Stomp Aqua 400 SC + Fusilade Forte 150 EC, (2) Reglone 200 SL + Fusilade Forte 150 EC and the foliar herbicides; (3) Lentagran 45 WP + Fusilade Forte 150 EC, (4) Betanal Elite 274 EC + Fusilade Forte 150 EC and (5) Boxer 800 SC.
Results. The lowest number and weight of weeds occurred after the applications of (1) Stomp Aqua 400 SC + Fusilade Forte 150 EC and (2) Reglone 200 SL + Fusilade Forte 150 EC. When using these herbicides the thistle was also the tallest (150 cm), had the highest plant density (25 pcs·m-2) as well as the highest yields (1.2 Mg·ha-1). After application of the other herbicides the number and weight of weeds were 3-5 times higher, while the density and height of the thistle plants were on average 55% lower and yields were almost 70% lower, additionally, after spraying with Lentagram 45 WP the 1000 fruit weight of milk thistle was significantly reduced.
Conclusion. Due to the growing international interest in the multidirectional use of milk thistle it is justified to continue the search for appropriate herbicides for the post-emergence control of dicotyledonous weeds.