Browse on keywords: weed biocontrol
Search results on 05/21/13
154. Alberta Agriculture, Crop Protection Branch. 1989. Guide to crop protection in Alberta. 1988. Part II - Non-chemical control of weeds, insects, diseases for maximum economic yield.. Print Media Branch, Alberta Agriculture, 7000 - 113 St.,.
Alberta Agriculture's non-chemical guide to crop protection contains 28 pages of general advice on how to control weeds, insects, and disease in crops without chemical pesticides. This includes crop rotation, sanitation, crop competition, physical control, biocontrol, and field scouting. The rest of the book looks at specific pests and considers their life cycles, emergence, reproduction, management strategies, and control. Where available, tables of economic thresholds are included. This is an excellent reference for assessing potential alternatives to chemical pesticides for a large number of pests.
1387. Cony, Ann. unknown. First of kind natural herbicide reported.. Sacramento Bee (newspaper).
Richard W. Jones, of UC-Berkeley, reported the use of a natural, self-destructing herbicide capable of killing a wide variety of weeds. It is made from a common soil fungus Gliocladium virens which is artificially charged with nitrogen, thus causing it to produce a compound that is toxic to plant roots for about 2 weeks. The herbicide can kill plant roots as well, but it doesn't hurt plant stems. Thus timing and placement are crucial. The herbicide prevents germination and emergence of weed seedlings, and also produces an antibiotic that protects crop seedlings from rotting.
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 unpublished report, USDA-ARS, PUllman, WA 99164-6421.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.
10691. Anon.. 1991. Scourge of leafy spurge.. Agrichemical Age, May 1991, p. 24-25.
Chemical control of leafy spurge with Tordon has proven effective, but is expensive and may cause environmental problems. A North Dakota ranch is using angora goats to suppress the weed on steep ground. Integrating herbicides with biocontrols shows promise. Six species of insects are available, and finding the appropriate niches for them is the next step.