Millions of unsuspecting Indian farmers are spraying fake pesticides onto their fields, contaminating soil, cutting crop yields and putting both food security and human health at risk in the country of 1.25 billion people.

The use of spurious pesticides has exacerbated losses in the genetically modified (GM) cotton crop in northern India after an attack by whitefly, a pest, say officials. If unchecked, some of India's roughly $26 billion in annual farm exports could be hit.

Made secretly and given names that sometimes resemble the original, counterfeits account for up to 30 percent of the $4 billion pesticide market, according to a government-endorsed study.