WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Tuesday, January 16, 2018

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1493. Cuthbertson, E.G.. 1969. Chondrilla juncea in Australia. 2. Preplanting weed control and wheat production.. Aust. J. Exp. Agric. Anim. Husb., 9:27-36.
Both lucerne and subterranean clover reduced skeletonweed populations significantly. The yield response comes from the temporary removal of the weed in the presowing period, rather than from the longer term reduction in weed cover. The response on plots with low weed density was not economic. Early suppression of the weed by any means increases grain yield. Critical density would be about 20% ground cover. My experience is that 30% groundcover generally warrants herbicide application. At lower densities, cultivation is more satisfactory.

2809. Hume, L.. 1982. The long-term effects of fertilizer application and three rotations on weed communities in wheat.. Can. J. Plant Sci., 62:741-750.
The effect of fertilizer application and three rotations (continuous cropping, fallow-wheat, and fallow-wheat-wheat rotations)on the species composition of the weed community was examined using rotations that had been running for 21-22 yrs. Fertilizer application tended to reduce community differences between continuous cropping and short-term wheat-fallow rotations. With the use of 2- or 3-yr wheat-fallow rotations and herbicide application, weed problems can be minimized in southeastern Saskatchewan.

7753. Young, Frank. 1989. Integrated pest management project update.. Paper presented at WA state weed conference, Nov. 13,1989.
This paper briefly describes the IPM weed study underway near Pullman, WA. This experiment uses field size plots for several rotation, tillage, and weed control treatments. Four years of research have been completed. Generally, the yield of spring cereals has not been affected by either weed management levels or tillage systems. Yields of spring peas were 17% greater with maximum weed management compared to the minimum level. Only three of the minimum tillage systems left sufficient residue cover to meet the 30% SCS requirement. However, all reduced tillage systems left more than 30% residue during the critical winter months. Yields of peas under conservation tillage were 13% greater than with conventional tillage, indicating the ability to reduce erosion potential with this crop and not suffer a yield penalty. No-till seeding has been successful either after spring wheat or spring peas, but not after the high residue of winter wheat.

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