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(Canadian thistle). Some weeds also propagate by means of tubers, which are modified rhizomes, such as Helianthus tuberosus (Jerusalem artichoke) and Cyperus (nut sedge or nut grass). Once a field is infested with these weeds, it becomes very difficult to control them. The weeds associated with different vegetable crops are given in Table 2.1.

Table 2.1: List of common weeds associated with different vegetable crops

S.No.	Name of Weed	English Name	Botanical Name	Crops Associated
1.	Chulai	Slender amaranth	Amaranthus viridis	Chili, onion and garlic
2.	Satyanashi	Mexican prickly poppy	Argemone mexicana	Chili and potato
3.	Bathua	Lamb's quarter	Chenopodium album	Tomato, brinjal, chili, cabbage, cauliflower, potato and radish
4.	Kandai/Lehli	Canadian thistle	Cirsium arvense	Tomato, potato and chili
5.	Doob	Bermuda grass	Cynodon dactylon	Tomato, brinjal, chili, onion, garlic, potato and radish
6.	Motha	Nut grass/Nut sedge	Cyperus rotundus	Tomato, cabbage, cauliflower, onion, garlic and carrot
7.	Takri Ghas	Crab grass	Digitaria sanguinalis	Cabbage and cauliflower
8.	Badi Dudhi	Garden spurge/Asthma plant	Euphorbia hirta	Chili, potato and cassava
9.	Hiran Pug	Field bindweed	Convolvulus arvensis	Radish and sweet potato
10.	Sabuni	Horse purslane	Trianthema portulacastrum	Potato, carrot and tomato

Figs 2.4–2.13 show weeds associated with major vegetable crops.

[Image: Crabgrass]

Fig. 2.4: Common Crabgrass
(Digitaria sanguinalis)

[Image: Asthma Plant]

Fig. 2.5: Asthma Plant
(Euphorbia hirta)

[Image: Field bindweed]

Fig. 2.6: Field bindweed or Hirankhuri
(Convolvulus arvensis)