Organic farmers dedicate their working lives to producing food with minimal use of pesticides, but by curbing the use of chemicals on their land, they can unknowingly damage their neighbor’s fence. may be causing a sharp increase in pesticide use.

Ashley Larsen and colleagues from the University of California, Santa Barbara, evaluated land use and pesticide data across 14,000 fields in Kern County, California. It is one of the largest agricultural counties in the state, producing agricultural products such as almonds, grapes, carrots, and pistachios.

The researchers found that when organic farmland is surrounded by conventional agriculture, neighboring farmers appear to increase their use of pesticides, which is associated with a 10 percent increase in organic farmland. Total pesticide use in conventional fields increases by 0.3%. Most of that is due to increased use of pesticides, the researchers found.

This is because more insects, pests or not, are present on organic land and tend to ‘bleed-off’ onto adjacent conventional farmland, leading these farmers to increase their use of pesticides. It is considered. “Pests come and sow the seeds for new outbreaks. [farmers] We will increase the use of pesticides,” Larsen told reporters at a press conference. This effect appears to be strongest when the adjacent field is within 2.5 kilometers of the organic “focal field”.

Conversely, the researchers found that the presence of organic fields was associated with reduced pesticide use in adjacent organic fields, with a 10 percent increase in the area of surrounding organic fields reducing total pesticide use on organic fields by 3%. He pointed out that it is associated with a decrease in the percentage of organic focal field. This may be because larger areas of organic farmland allow for larger and more stable communities of beneficial insects.

Organic agriculture only covers about 2 percent of the world’s land, but in Kern County, about 5.5 percent of the farmed area is organic.

If organic farming occupies a high proportion of agricultural land, perhaps Researchers say that regardless of where organic fields are located, net pesticide use is reduced by more than 20 percent.

However, when relatively small areas of organic cropland are evenly distributed across the landscape, such as in Kern County, net pesticide use may actually be higher than if no organic cropland were present.

“Our simulations suggest that low levels of organic agriculture in the landscape may actually increase net pesticide use,” Larsen said.

However, she said this impact can be completely mitigated by clustering organic farmland to minimize potential pest spillover. “Basically, at the policy level, how do we encourage the spatial clustering of new organic fields to take advantage of the pest control benefits of organic and limit the potential costs of organic to conventional growers?” It might be worth considering.

This could include paying subsidies to farmers to convert more land to organic farming in certain areas, or even creating buffer zones between organic and non-organic land. be.

robert finger Switzerland’s ETH Zurich said the study results demonstrate the need for policymakers to consider land use policy at a “landscape scale” to maximize the environmental benefits of organic farming. “Fundamentally, it’s not enough to think about a single field or a single farm,” he says.