Efficiency and crop compatibility of different herbicides in <i>Solanum sisymbriifolium</i>

Abstract

In the context of a joint project Solanum sisymbriifolium was successfully grown as antagonistic field crop against potato cyst nematodes (Globodera rostochiensis). The slow growing Solanum has little competitiveness against weeds. Therefore a successful cultivation is completely dependent on an effective weed control. In 2016 plot trials were conducted (conventional and logarithmic) in order to find efficient and compatible herbicides.
In order to control larger weeds, all soil herbicides were sprayed in combination with a glyphosate-herbicide within the conventionally sprayed plot trials. Crop compatibility was the major limiting factor of the herbicides. Post-emergence treatment with Biathlon (tritosulfuron) caused severe growth inhibition. Full application rate of Boxer (prosulfocarb) and ¾ of Novitron (aclonifen+clomazone) started to be incompatible for plants. A comparably good crop compatibility showed 0.25 L/ha Centium (clomazone) 1.0 L/ha, 1.0 L/ha Bandur (aclonifen), 0.9 kg/ha Novitron, 1.0 kg/ha Proman (metobromuron) and the application sequence of 1.0 L / 0.01 g/ha Bandur/Cato (aclonifen/rimsulfuron).
Logarithmic application showed the limits of application rates for Bandur around 20 l/ha and for Proman around 1.0 kg/ha. Sencor Liquid and Stomp Aqua had a very narrow range of crop tolerance.
Most of the existing weed species were controlled by the herbicides with the exception of Senecio vulgaris, which was sufficiently controlled exclusively by Centium associated with simultaneous crop compatibility.