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Time of Emergence of Eight Weed Species

Published online by Cambridge University Press:  12 June 2017

Alex G. Ogg Jr.  and
Jean H. Dawson
Alex G. Ogg Jr.
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Irrigated Agric. Res. and Ext. Ctr., Prosser, WA 99350
Jean H. Dawson
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Irrigated Agric. Res. and Ext. Ctr., Prosser, WA 99350
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Abstract

Under irrigated field conditions at Prosser, WA, Russian thistle [Salsola kali (L.) var. tenuifolia Tausch. ♯3 SASKR] began to emerge by mid-March each year and usually had completed its emergence by May 1. Common lambsquarters (Chenopodium album L. ♯ CHEAL) was the next to appear, usually during the third or fourth week of March. Barnyardgrass [Echinochloa crus-galli (L.) Beauv. ♯ ECHCG], redroot pigweed (Amaranthus retroflexus L. ♯ AMARE), hairy nightshade (Solarium sarrachoides Sendt. ♯ SOLSA), black nightshade (5. nigrum L. ♯ SOLNI), eastern black nightshade (S. ptycanthum Dun.), and cutleaf nightshade (S. triflorum Nutt. ♯ SOLTR) generally began to emerge during the first 2 weeks of April and emergence generally peaked mid-April to mid-May. Russian thistle and cutleaf nightshade had the most restricted emergence patterns, whereas seedlings of common lambsquarters, redroot pigweed, hairy nightshade, and black nightshade emerged each month from April through September. Shallow tillage at monthly intervals increased the overall emergence of common lambsquarters, redroot pigweed, black nightshade, and eastern black nightshade; decreased the emergence of barnyardgrass; and had no effect on the emergence of Russian thistle, cutleaf nightshade, or hairy nightshade.

Keywords

Amaranthus retroflexusChenopodium albumEchinochloa crus-galliSalsola kali var. tenuifoliaSolanum nigrumSolanum ptycanthumSolanum sarrachoidesSolanum triflorumtillage effectAMARECHEALECHCGSASKRSOLNISOLSASOLTR
Type
Weed Biology and Ecology
Information
Weed Science , Volume 32 , Issue 3 , May 1984 , pp. 327 - 335
Copyright
Copyright © 1984 by the Weed Science Society of America 

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