الفهرس | Only 14 pages are availabe for public view |
Abstract P rennial weed are generally the most dtfficulr weeds to control and are problematic. in crop production ·odd ride. The Lllajor factor contributing t difficulty of control i vegetative reproduction by underground propagule .. and their carbohydrate r erve that afford tremendous comp titive advantage over associated crops in Egypt. Th four tudied of perennial weeds i.e, cogongras ”lmperata cylindrica (L.) p.” bennudagra 5 ”Cynodon dactylon ) per .”, nutsedge ”Cyperus rotundas L.” and field bindweed” ’onvolvulu a/”V(!nS;S L.” are th domiaant noxious weed and ind ed in mot parts ofthe world. Imperato cylindrtca (L.) p. Beauv, a coarse. oulms olid and tall.propagating through eeds and rhizomatous stein. 4 gra . Il now-leaf monocor. and Gramineae . Cynodon d ictylon (L) pers .. 11 tufted troloniferou grass, propagating the rough scaly rhizomes and eeds 4 grass, narrow-leaf mono cot. and Gramineae), OllVO,”,1I1I1 arvensi 1-., a rwnung herb .. with deep ’Underground root propagation through e d and roots (sucke ) ( weed, broad -leaf dicot. and Couvolvulaceae). )perlls rotundas L., a sedge with triquetrous stem perennaring and propagating through the underground rhizomatiou .tem and tubers (C4 weed narrow-leaf. 111011ocot, nursedge and yperaceae.), These weeds had wide distribution and adaptation to a wide range of climatic conditions and soil. high competition ability with many crops and re i tauce to coorrol. TIley an iprout And grow more rapidi than 1110 t crops and reproduce exually from .eeds aud vegetatively underground part. |