What are weedicides ? Write name any 5 weed and weedicides
Answers
Explanation:
among wanted crops and compete with crop plants for sunlight, nutrients, water etc.
Weedicides are the chemicals which are sprayed over field to get rid of weeds. They will not show any effect on crop plants. Two popularly used weedicides are 2,4-D Ethyl ester, Neem extract, Glyphosate etc.
Weeds extend the harmful effects slowly, steadily and inconspicuously and the effect is almost unchangeable.
If no restriction is imposed they compete with crop plants and the yield reduction of individual crops varies and that of cropping system 5 to 50%.
Presence of weeds increases the cost of agriculture and hinders the progress of work.
It increases the irrigation requirement.
They reduce the value of produce or otherwise adds the cost of cleaning.
Some weeds when eaten (Cleome viscosa) by milch animals will produce an undesirable odour in the milk. At times death/disorder/disformity may occur.
eg: Datura stramarium
The fruits and seeds of Xanthium strumarium and Achyranthes aspera entangle with wool which fetch lower prices.
They harbour insect pests, pathogen and parasites
They reduce the value of the land
Presence of weeds will impair the purity of varieties by chance of cross pollination
Weeds cause health hazards to man and animals
Weeds cause allelopathic effect
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