One study reduced millipede invasion into a structure by what percent using non-chemical control?

• A. 70%
• B. 93%
• C. 50%
• D. 10%

Answer: (B)

Non-chemical control works best when you remove access and favorable conditions for millipedes. Sealing cracks and gaps, adding door sweeps and screens, fixing leaks, eliminating moisture and humidity around the foundation, and reducing debris or mulch near the structure all disrupt the pathways millipedes use to enter and survive indoors. When these prevention and habitat-modification measures are applied comprehensively, the reduction in invasions can be very high, around 93%, showing how powerful exclusion and moisture-management can be as a first line of defense. The other percentages represent progressively less impact, so the large 93% figure stands out as the most effective outcome for non-chemical control in this context.