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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.