Susceptibility of Five Species of theSolanum nigrumComplex to Herbicides

Abstract

Eight accessions of weedy nightshades representing five species were evaluated for response to four herbicides applied preemergence in growth chamber studies and four herbicides applied postemergence in greenhouse studies. Species differed in susceptibility to all herbicides evaluated. The largest differences were found with postemergence applications of chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide}; hairy nightshade (Solanum sarrachoidesSendt. ♯ SOLSA) was relatively susceptible, but eastern black nightshade (S. ptycanthumDun.) was very tolerant.S. ptycanthum, however, was one of the more susceptible species. It was always more susceptible than black nightshade (S. nigrumL. ♯ SOLNI) to all other herbicides evaluated.