A new model developed by scientists at the University of California, Davis, shows how crop rotation can help farmers combat plant pests. The model, published in the journal Nature Communications, simulates how pests move through a field and interact with different crops. It found that crop rotation can reduce pest populations by up to 50%, and that the benefits of crop rotation increase as the number of crops in the rotation increases.

"Crop rotation is a powerful tool for managing pests, but it's not always clear how it works," said Ian Kaplan, a professor of environmental science and policy at UC Davis and lead author of the study. "Our model provides a new way to understand how crop rotation affects pests, and it can help farmers design more effective crop rotation strategies."

Crop rotation is a farming practice that involves growing different crops in the same field in a sequence. This practice can help to improve soil health, reduce erosion, and control pests. Pests can build up in a field if the same crop is grown year after year, but crop rotation can disrupt their life cycle and make it more difficult for them to survive.

The new model developed by Kaplan and his colleagues simulates how pests move through a field and interact with different crops. The model takes into account the pests' movement patterns, the crops they prefer to eat, and the timing of their life cycle. The model also simulates the effects of crop rotation on pest populations.

The model found that crop rotation can reduce pest populations by up to 50%. The benefits of crop rotation increased as the number of crops in the rotation increased. This is because a greater diversity of crops makes it more difficult for pests to find the food they need to survive.

The model also found that the timing of crop rotation is important. Pests are most likely to build up in a field if the same crop is grown year after year. By rotating crops, farmers can disrupt the pests' life cycle and make it more difficult for them to survive.

The model developed by Kaplan and his colleagues can help farmers design more effective crop rotation strategies. The model can be used to predict how pests will move through a field and interact with different crops. This information can help farmers select crops that are less likely to be damaged by pests, and to time crop rotations so that they are most effective at reducing pest populations.

"Crop rotation is a simple and effective way to manage pests," said Kaplan. "Our model can help farmers use crop rotation more effectively to protect their crops and improve their yields."