Science Explains How Pesticides Can Contribute to Food Shortages

Science Explains How Pesticides Can Contribute to Food Shortages



Scientists have discovered that pesticides may lead to food shortages because of their adverse effect on bees. Specifically, the researchers found a group of pesticides called pyrethroids that contribute to colony collapse disorder in bees. This occurs when worker bees disappear, causing the queen and other members of the hive to die. Without bees, hundreds of billions of dollars worth of crops would not get pollinated, and agriculture would greatly suffer.


Because of the profound importance of bees, scientists wanted to investigate if they could separate the pesticides from the honey somehow. Researchers at the University of Waterloo created an eco-friendly, completely automated technique that extracts honey’s pesticides. This way, the worker bees will not leave the hive, and colony collapse disorder may improve.

How they removed the pesticides from the honey

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The team extracted the pyrethroids using the solid-phase microextraction (SPME) method. This made it easier for them to measure whether honey levels exceed what is safe for human consumption. It also helps pinpoint locations where farmers utilize this pesticide and how much they use. Because of its chemical makeup, the pesticide has previously been difficult to remove.

“Pyrethroids are poorly soluble in water and are actually suspended in honey,” said Janusz Pawliszyn, a chemistry professor at Waterloo. “We add a small amount of alcohol to dissolve them prior to extraction by the automated SPME system.”


When farmers spray the pesticides on crops, it affects the functioning of insects’ nerves and brains. This can lead to paralysis and ultimately death in certain species. Pesticides have been classified as neurotoxins, which is any substance that alters the structure or function of the nervous system. However, because they have been so effective at controlling insect infestations, weeds, and disease, they’re now used worldwide.

While the Environmental Protection Agency says that we need pesticides to protect crops and increase yields, they have their disadvantages. When used in excess, they can lead to mass bee die-offs, which means crops don’t get pollinated. Without bees, we couldn’t have food, so a balance must occur between protecting crops and pollinators.


“It is our hope that this very simple method will help authorities determine where these pesticides are in use at unsafe levels to ultimately help protect the honeybee population.” ~Janusz Pawliszyn

As some of the research team was based in Canada, they performed tests on honey products there. The Canadian Food Inspection Agency inspects foods for chemical residues there. The Pest Control Products Ac regulates maximum allowed residue limits. The team found no indication that any honey had excess pesticide levels.

However, aside from killing bees, pesticides cause food shortages in other ways as well. While pesticides do increase crop yields, they cause damage to biodiversity, which disrupts the food chain. Studies have shown that pesticides have caused widespread contamination of ecosystems worldwide. Many studies have also found negative effects on the physiology, diversity, and abundance of certain aquatic and terrestrial organisms.

Furthermore, pesticides cause widespread deterioration of biodiversity in agricultural areas, which comprises around 50% of Earth’s ice-free land. In Germany, insect losses of around 70% have been observed in the last 30 years, and bird species in Europe have declined by 50%. Major pollinators such as bees, hummingbirds, and monarch butterflies have also decreased in numbers in the past few decades.

In a European study, researchers found that pesticides were the sole culprit behind lower biodiversity in plants, ground beetles, and birds in wheat fields. They accounted for differences in field size, fertilizer application, and landscape diversity in the study. Another review labeled pesticides and chemical pollution as the second leading cause of a worldwide decline in insect populations. As we’ve said, without insects and pollinators, we cannot have crops to use pesticides on in the first place.

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