Category - hairy
) is one of the most difficult weeds to control in idaho and pacific northwest potato fields. It can emerge close to the same time as potatoes, germinate the entire growing season and produce viable seeds even if it emerges a little more than a month before potato harvest. Most herbicides that affect nightshades also affect potato making control difficult. Three species of nightshades are common in the north central states. Sarrachoides) is native to south america and is found coast to coast along the south of us but is also found as far north as eastern nebraska, eastern s. Hairy nightshade has proved troublesome in potatoes for reasons such as 1) same family as potato so control methods safe to the crop and detrimental to the weed may be limited, 2) can germinate the entire potato growing season, therefore, control must last season-long, and 3) even if controlled early to avoid competition with resulting yield losses, later germinating hairy nightshade can host. There are no known biological control agents for hairy nightshade. Mowing, tillage, and hand pulling over the course of several years can help eradicate black nightshade if done prior to seed set. A number of herbicides are available to control hairy night shade. Nightshade control options many herbicides are registered for use in dry bean. Early season nightshade control can be acceptable however, for full season control an effective post product needs to be applied. Other products have limited application flexibility due to potential crop injury. Rimsulfuron controls hairy nightshade, but not eastern black nightshade, in tomato article in hortscience a publication of the american society for horticultural science 40(7) december 2005. Blackberry nightshade (solanum nigrum) is very similar to glossy nightshade (solanum americanum), and intermediates between the two species are sometimes seen. hairy nightshade effects on potato cultivars resistant to columbia root-knot nematode. Weeds affect nematode populations by acting as alternative hosts, and several researchers have emphasized the importance of weed control for management of plant parasitic nematodes (belair and parent 1996 davis and webster 20 roberts 1993 thomas et al.). aphid transmission of plrv from hairy nightshade to potato was four times greater than the virus transmission rate from potato to potato.