Cultural and Mechanical Manipulation ofCyperusSpp.

Abstract

Cultural and mechanical methods are viable options for inclusion in any weed control program. Selection of weed control methods is determined by crop, cost, desired yield, weather, and labor availability. Yellow and purple nutsedge (Cyperus esculentusL. # CYPES and C.rotundusL. # CYPRO) have proliferated as production inputs have intensified. Nutsedge densities have increased largely due to reduced competition as better annual weed control and improved growing conditions have resulted.

Desenvolvimento da tiririca (Cyperus rotundus) influenciado pela presença e ausência de palha de cana-de-açúcar e herbicida

“…O menor percentual de cobertura para os tubérculos plantados na superfície pode ter sido causado pela combinação entre a ação direta do herbicida sobre os tubérculos e, segundo Glaze (1987), a ação direta do sol e as elevadas temperaturas.…”

“…Nestas, mesmo os tubérculos plantados na superfície (P0) resultaram em percentual de cobertura próximo de 10%, aos 10 DAA, e superior a 40%, a partir dos 60 DAA. Esse comportamento possivelmente seja atribuído à menor incidência solar diretamente sobre os tubérculos e à maior umidade na camada superficial do solo, proporcionada pela palha (Glaze, 1987).…”

“…Entre os métodos de controle, Glaze (1987) citou a luz e as elevadas temperaturas na superfície do solo, por causarem a morte dos bulbos basais e dos tubérculos por desidratação.…”

Yellow Nutsedge (Cyperus esculentus) Interface in Peanut (Arachis hypogaea)

“…Yellownutsedge management in peanut is dependent on an integrated system of herbicides, mechanical, cultural, and biological control tactics (Hauser et al, 1966;Thurston, 1976;Linscott et al, 1978;Keeley and Thullen, 1983;Glaze, 1987;ThullenandKeeley, 1987;Gricharetal., 1992;Richburg et al, 1993Richburg et al, , 1994Grichar and Nester, 1997). Effective herbicides reduce tuber production and viability (Banks, 1983).…”

Assessment of Tuber Viability and Sprouting Behavior of Purple Nutsedge (Cyperus rotundus) - A Prelude Study for Control of World Worst Weed

“…Cultural practices like field plough, hand weeding, hoeing through implements increase the infestation of these perennial weeds rather than controlling and also cultural control methods such as crop rotation and cultivation (Glaze, 1987) and soil desiccation do not provide sufficient control of this weed. Purple nutsedge has proved difficult to control with herbicides.…”