Browse on keywords: weed WA
Search results on 05/18/13
9216. Alvord, E.D.. 1918. A study of Washington weeds.. M.S. thesis, Washington State College, Pullman, WA.
356. Anon.. 1989. Fine-tuning mix water.. Agrichemical Age, October 1989.
Herbicide performance can be greatly affected by the quality of the tank mix water. Water-soluble post emergent herbicides, such as glyphosate and phenoxys, seem to be most sensitive. Three factors are important: water pH; cation concentration; and suspended solids. Post-emergent herbicides perform best when the tank mix is acidic. Optimum for phenoxys and glyphosate is pH 3-4. Hard water will reduce activity when herbicides are mixed and stored for many hours. Cation effects on deactivation are as follows: most severe - Fe++, Fe+++, Al+++; severe - Ca++, Zn++; moderate - Mg++; minimal - K+, Na+. Water with suspended dirt or organic matter will bind with many herbicides.
1738. Drum, B.B.. 1916. Some common weeds of the Palouse country, their seeds and seedlings.. MS Thesis, Washington State College, Pullman.
Detailed descriptions of names, origin, range, physiology, lifestage, economic significance, eradication, seeds, habitats, seed vitality, and identification of: Alyssum alyssoides (L)Govan; Amaranthus blitoides, Wats; A. graecizans, L.; A. retroflexus, L.; Bromus brizaeformis, Fisch.; Chenopodium album, L.; C. alba viride, L.; Cirsium lanceolatum, Scop.; Dipsacus sylvestris, L.; Erodium cicutarium, L.; Polygonum convolvulus, L.; Rumex acotosella, L.
1882. Erickson, L.C.. 1978. Skeletonweed in Australia. Tri State Skeletonweed consortium.. ID Agr. Expt. Sta. Misc. Series #46.
Describes the history of this weed in Australia and the parallels to problems with it in the PNW.
2221. Goldstein, Walter A.. 1986. Alternative crops, rotations, and management systems for dryland farming.. Ph.D. dissertation, Agronomy and Soils, WSU.
This work covers a number of research areas, including the use of edible white lupine as an alternative crop, the use of black medic in rotation with spring peas and winter wheat (the PALS concept), performance of winter wheat as influenced by rotations, fertilization, and fumigation; rotational effects of medics; wheat interference with weeds; costs and returns of alternative systems; comparison of agronomic effects of conventional, organic, and biodynamic management. The PALS (perpetuating alternative legume system) concept was field-tested using a pea + medic - medic GM - winter wheat rotation with limited inputs of agrichemicals and tillage. This system was more economic using market prices of commodities at both a low and high yield level. With government support prices, the PALS system was competitive in the low yield situation, but not the high. Rotational effects appeared to suppress weeds in wheat with the medic compared to a continuous cereal system.
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.
3021. Swan, D.G.. 1983. Weed control in winter wheat.. WSU Extension Service, Ext. Bull. #599.
Keep the problem from occurring. Use crop rotation, especially a spring crop, to upset the weed species cycle. Eradicate all new weed species before they spread. Keep weeds from producing seed in the field.
3029. Swan, D.G.. 1972. Weed control in winter wheat in eastern Washington.. Proc. 11th Br. Weed Control Conf., vol.2, p.681.
Bromoxynil, while less effective on some weed species, was the most selective herbicide. Diuron, linuron, and terbutryne frequently reduced yields on soils with less than 1.5% organic matter.
3559. Kennedy, A.C., F.L. Young, and A.G. Ogg. no date. Control of downy brome and jointed goatgrass using soil bacteria.. unpublished report, USDA-ARS, PUllman, WA 99164-6421.
Naturally occurring soil bacteria were isolated that inhibited the growth of downy brome and jointed goatgrass, but not winter wheat. Over 5000 isolates were examined, and more than 50% were inhibitory to one of the weeds in laboratory growth. In a field test, plant population and above ground growth of downy brome were reduced 31% and 53% respectively. The bacteria were active at cool temperatures, an advantage in suppressing the weed after fall emergence. The bacteria are viewed as an adjunct to herbicide control, as their suppression is not enough to prevent economic crop loss. However, the lack of available herbicides for goatgrass makes this potential control very important. Proper application methods to insure organism survival are yet to be worked out.
4331. McGill, Steve. 1990. Handling herbicide resistance in Russian thistle.. The Furrow (April 1990, NW edition).
Herbicide resistant biotypes of Russian thistle have been identified for Glean and Finesse. These herbicides can no longer be used alone for this weed. More tillage may have to be substituted in some situations, and implements which leave maximum surface residue are recommended. A heavy infestation of Russian thistle reduced yields of spring wheat 11% in a wet year and 55% in a dry year, so control is important for moisture conservation.