Author : Sheila Florence Forsyth
Publisher :
ISBN 13 :
Total Pages : 658 pages
Book Rating : 4.:/5 (615 download)
Book Synopsis Stress Physiology and Biological Weed Control by : Sheila Florence Forsyth
Download or read book Stress Physiology and Biological Weed Control written by Sheila Florence Forsyth and published by . This book was released on 1983 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The success of biological weed control programs has been limited by a lack of understanding of the stress physiology of insect damage and pathogen development. This case study with the perennial weed, Cirsium arvense, (L.) Scop. evaluated the stress of five natural enemies. Attack by a seed head predator, Orellia ruficauda (F.) caused about 21.5% predation and may reduce seed dispersal. The stress of stem gall formation (Urophora cardui (L.)) is greatest when the gall occurs on young plants and on the mainshoot and defoliation simulation (Cassida rubiginosa Muller) is most effective at high levels on young plants. In nature, however, the latter two natural enemies are not synchronized with these susceptible stages, thereby reducing their effectiveness. Although Cleonus piger Scop., a root crown inhabitant, can result in plant death, regeneration of damaged vascular tissue can occur. Plants which emerge systemically infected with Puccinia punctiformis (Str.) Rohl. (rust) rarely survive the season. A matrix model simulating the effects on Canada thistle population dynamics by the natural enemies was applied." --