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Which one among the following chemicals is used for causing defoliation of forest trees?

1. Phosphon-D
2. Malic hydrazide
3. 2, 4-Dichlorophenoxy acetic acid
4. Amo-1618

Correct answer: 2, 4-Dichlorophenoxy acetic acid

Solution

2,4-Dichlorophenoxy acetic acid (2,4-D) is a synthetic auxin herbicide that, at suitable concentrations, causes abnormal growth and leaf abscission, so it is used for defoliation. The other options are mainly growth retardants or inhibitors, not classic defoliants.

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