Horticulture Research Station

Organic Pest Management of Broccoli using Mesotunnels

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Abstract

Broccoli is a staple crop in the Midwest, which is damaged by several insect pests. Pests such as imported cabbage worms, cabbage loopers, and diamondback moths can be destructive to the crop at different growth stages. Organic pesticides to manage these pests have mixed results and account for increased labor and costs. Mesotunnels could be a viable pest management approach in organic production systems. “Meso” means “middle,” so mesotunnels are medium-sized tunnels—taller than low tunnels and shorter than high tunnels. A breathable nylon mesh fabric (brand names include ProtekNet and ExcludeNet) that resembles a window screen is placed over the mesotunnel. The fabric acts as a barrier to insect pests, preventing their entry and the spread of disease-carrying pathogens. In addition, it can protect the crop from extreme weather conditions, such as hail damage. The objective of the study is to compare pest incidence, marketable yield, produce quality, netting longevity, and microclimatic conditions of mesotunnel structures with OMRI-listed insecticides in organic broccoli production. We hypothesize that mesotunnels will reduce biotic and abiotic stress and increase marketable yield. Using the same netting material throughout the seasons will increase revenue. The goal is to provide a mesotunnel protection system which protects the diversified cropping systems from biotic and abiotic factors.

How to Cite:

Thinakaran, A. & Nair, A., (2026) “Organic Pest Management of Broccoli using Mesotunnels”, Iowa State University Research and Demonstration Farms Progress Reports 2025(1), 5-6.