1. A method for detecting agricultural volatile and semi-volatile organic compounds, the method comprising: (a) training bees to exhibit a proboscis extension response when exposed to a selected volatile or semi-volatile organic compound (VOC/SVOC), the training comprising: exposing a bee to background air; exposing the bee to the selected VOC/SVOC; and exposing the bee to said selected VOC/SVOC while stimulating an antennae of the bee with a sugar solution to produce a trained bee; (b) exposing the trained bee to a sample; and (c) observing a response of the trained bee to the exposure of the sample; (d) wherein the presence of the selected VOC/SVOC from the sample will cause the trained bee to exhibit a proboscis extension response.