TY - JOUR
T1 - Dry pea (Pisum sativum L.) response to low rates of selected foliar- and soil-applied sulfonylurea and growth regulator herbicides
AU - Al-Khatib, Kassim
AU - Tamhane, Ajit
PY - 1999
Y1 - 1999
N2 - Field experiments on dry pea (Pisum sativum) were conducted at five locations across the United States in 1995 and 1996 to investigate the effects of low rates of chlorsulfuron, thifensulfuron, and dicamba applied postemergence and of chlorsulfuron, metsulfuron, and clopyralid applied preplant incorporated in the soil on pea plants. Although chlorsulfuron, thifensulfuron, and dicamba caused significant injury symptoms on pea plants, they had little effect on yield. The lowest rates of foliar applications that caused observable symptoms were 0.035, 0.086, and 1.56 g ai/ha for chlorsulfuron, thifensulfuron, and dicamba, respectively, whereas chlorsulfuron, thifensulfuron, and dicamba rates that reduced pea yield by 25% were 0.18, 1.36, and 25 g/ha, respectively. Clopyralid caused more injury symptoms than metsulfuron or chlorsulfuron with soil application. However, the lowest rates of chlorsulfuron, metsulfuron, and clopyralid that caused observable symptoms were lower than the rates that reduced yield. This study showed that pea plants can sustain some level of plant injury without a large reduction in yield.
AB - Field experiments on dry pea (Pisum sativum) were conducted at five locations across the United States in 1995 and 1996 to investigate the effects of low rates of chlorsulfuron, thifensulfuron, and dicamba applied postemergence and of chlorsulfuron, metsulfuron, and clopyralid applied preplant incorporated in the soil on pea plants. Although chlorsulfuron, thifensulfuron, and dicamba caused significant injury symptoms on pea plants, they had little effect on yield. The lowest rates of foliar applications that caused observable symptoms were 0.035, 0.086, and 1.56 g ai/ha for chlorsulfuron, thifensulfuron, and dicamba, respectively, whereas chlorsulfuron, thifensulfuron, and dicamba rates that reduced pea yield by 25% were 0.18, 1.36, and 25 g/ha, respectively. Clopyralid caused more injury symptoms than metsulfuron or chlorsulfuron with soil application. However, the lowest rates of chlorsulfuron, metsulfuron, and clopyralid that caused observable symptoms were lower than the rates that reduced yield. This study showed that pea plants can sustain some level of plant injury without a large reduction in yield.
KW - Chlorsulfuron
KW - Clopyralid
KW - Dicamba
KW - Foliar symptoms
KW - Metsulfuron
KW - Thifensulfuron
KW - Yield
UR - http://www.scopus.com/inward/record.url?scp=0033370785&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033370785&partnerID=8YFLogxK
U2 - 10.1017/s0890037x00042184
DO - 10.1017/s0890037x00042184
M3 - Article
AN - SCOPUS:0033370785
SN - 0890-037X
VL - 13
SP - 753
EP - 758
JO - Weed Technology
JF - Weed Technology
IS - 4
ER -