HERBICIDE SELECTIVITY EXPLAINED

HERBICIDE SELECTIVITY EXPLAINED

This is the ability to kill certain plants and leave others unaffected selectivity of herbicides depends on the following factors.




i) Size of leaves;

The larger the leaf, the more the herbicide will affect the leaf

ii) Degree of wetting on the leaf;

During spraying, the more the wetting, the more the effect of herbicide

iii) Resistance to herbicides;

Some weeds have in built physiological resistance and can detoxify the herbicides making them harmless.

iv) Timing of application

Old weeds are less affected by herbicides than young weeds
Stage of application i.e. Pre emergent, post emergent




v) Structure of the plant

Some plants have hairy leaves, others produce wax, and all these hinder herbicides from penetrating weeds.

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