Effect of BT cotton can be described by the two terms as advantage and disadvantage

Advantage:

1) Increases yield of cotton endotoxic protein produced by Bt gene which cotton from bollworms 2) Reduction in pesticide

3) Reduce the cost of cultivation and lower farming risks.

Disadvantage:

1) The efficacy of Toxin is less and effect stands for 120 days

2) The cost of Bt cotton seeds is high compared to non-Bt cotton seeds.

3) Sometimes, it found to be Ineffective against pests like aphids, whitefly etc.