Floating Row Cover vs Insect Netting Which Is Better

How does the light transmission capacity differ between floating row covers and insect netting?

Floating row covers are typically made of spun-bonded polypropylene, which acts as a physical barrier that diffuses light. This diffusion can be beneficial for young seedlings, as it prevents harsh shadows and reduces ultraviolet stress. However, the density of the fabric significantly limits the total photosynthetically active radiation reaching the leaves. For instance, a medium-weight cover might reduce light levels by 25 percent, which can lead to leggy, weak growth in light-demanding crops like tomatoes if left on too long.

In contrast, insect netting uses a woven monofilament construction that maintains high transparency. It allows almost the full spectrum of sunlight to reach the plant, which is better for fruit development. One nuance is that even high-transmission netting can slightly alter the light quality, potentially affecting the timing of flower induction in certain photoperiod-sensitive cultivars.

What are the primary differences in heat retention between these two protective materials?

Floating row covers excel at heat retention because the dense fibers trap a layer of warm air against the soil surface, effectively creating a micro-climate that can raise temperatures by 3 to 5 degrees Fahrenheit. Insect netting is designed for maximum ventilation and offers negligible thermal gain. Many gardeners assume that netting provides some frost protection because it looks like a barrier, but it offers virtually no insulation. If a late spring frost is forecasted, the netting will not prevent damage to tender foliage.

Which material provides superior protection against specific types of garden pests?

Insect netting is the superior choice for excluding mobile pests, whereas row covers are better at creating a barrier against soft-bodied insects that can crawl through larger mesh sizes.

• Flea beetles: These tiny, jumping pests easily penetrate standard row covers, requiring fine-mesh netting with a 0.3mm to 0.5mm aperture to keep them away from brassicas.
• Cabbage loopers: Larger moths are physically blocked by both materials, but netting remains the better choice because it prevents the buildup of humidity that encourages fungal rot on the leaves.
• Aphids: These insects are small enough to bypass most standard covers, making fine-mesh netting the only effective physical exclusion method.

How does air permeability affect plant health and disease development under these covers?

High air permeability in netting prevents the buildup of stagnant, humid air that often promotes fungal pathogens like powdery mildew. While row covers can trap moisture, netting allows consistent airflow, keeping relative humidity levels near ambient conditions and reducing the risk of bacterial leaf spot by up to 40 percent.

What are the durability and longevity differences when comparing synthetic fleece to mesh netting?

Synthetic mesh netting is significantly more durable than spun-bonded row cover, often lasting 5 to 7 years with careful handling, while row covers frequently degrade after a single season of UV exposure.

• UV degradation: Spun-bonded fabrics lose structural integrity and become brittle after one season in the sun, whereas high-density polyethylene netting resists breakdown for years.
• Abrasion resistance: Mesh netting withstands wind whipping and contact with sharp plant stems, while row cover tears easily if it snags on a support hoop.
• Storage requirements: Mesh can be folded and stored in a shed indefinitely, but row cover often crumbles if stored in environments with fluctuating temperature or moisture.

In what climate conditions is one material more advantageous than the other?

In regions with short growing seasons or cool springs, floating row covers are essential tools. They act as a season extender, allowing for earlier planting by warming the soil and protecting young transplants from chilly winds. For example, a gardener in a northern climate might use these covers to get a three-week head start on spinach or lettuce production. However, even in cool climates, the cover must be removed during sunny, warm afternoons to prevent heat stress.

Conversely, in humid, subtropical climates, insect netting is the only viable option for summer production. The high heat and humidity levels in these areas make row covers dangerous for plant health, as they promote rapid pathogen growth. An exception exists for crops that require extreme shade; in such cases, specialized shade-cloth netting provides both pest protection and necessary light reduction without trapping excessive heat.

How does the weight of the material impact the need for support structures during the growing season?

Yes, the weight of the material dictates the support structure, as heavy row covers can weigh up to 2 ounces per square yard, requiring sturdy, spaced hoops. Lighter netting often weighs less than 0.5 ounces per square yard, allowing for more flexible, lightweight wire supports or even direct application.

What are the trade-offs regarding water penetration and irrigation efficiency for each option?

Floating row covers generally allow water to pass through, though heavy fabrics may cause runoff, while netting allows for nearly unimpeded water penetration.

Use these percentages to adjust your irrigation timers, as you will need to increase water volume when using heavier covers to compensate for the significant amount of water that is shed before reaching the root zone.