Pesticide residue detectors used in wholesale vegetable markets are not reliable with ginger and other spicy produce, said a Weifang, Shandong province, official.

Since CCTV reported illegal sales and the use of Aldicarb, a highly toxic pesticide, in Weifang, many consumers are now paying great attention to the quality of ginger.

The Weifang government has cracked down on illegal Aldicarb sales and use, but concerns remain.