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Sowbugs and Pillbugs

Order Isopoda: Family Armadillidiidae


DESCRIPTION:

Adult: About ¼ to ½ inch long, with a rounded upper surface and flat lower surface. They are dark gray in color with armor-like body segments (Fig. 6.6). Sowbugs and pillbugs are not insects, but are soil dwelling crustaceans. They have 7 pairs of legs, prominent antennae, and two tail-like appendages.

 Figure 6.6Figure 6.6 - Pillbugs and sowbugs have dark gray or brown bodies with armor-like body segments.

Egg: Up to 200 eggs are carried in a pouch under the female body.

Young: Young sowbugs and pillbugs look like adults but are paler in color and smaller.

LIFE HISTORY:

Eggs hatch into young sowbugs and pillbugs, and remain in the pouch up to 2 months after hatching. It requires about 1 year for young sowbugs and pillbugs to develop into adults. Adults breed mainly in the spring and may live up to 3 years. As many as three broods per year are possible.

DAMAGE:

Sowbugs and pillbugs feed on melon rinds (especially cantaloupe) when fruits rest on soils with high levels of organic matter on the surface. They occasionally damage roots, seedlings, foliage and fruit that contact the soil.

MANAGEMENT:

Cultural:

  • Minimize soil moisture. Reduce soil moisture as fruits ripen to deter the attraction of sowbugs and pillbugs to the area. Sowbugs and pillbugs rely on moist soil to survive and will not live in soil that is too dry to support them.
  • Remove debris such as trash plant debris or wood. Debris encourages soil moisture and protected sites that will attract sowbugs and pillbugs.
  • Mulches. Place straw, plastic, cardboard, landscape fabric, carpet, or other types of mulches under cantaloupes and other fruits and vegetables that tend to sit on or contact the soil as they ripen. These mulches will create a barrier between the ripening fruits and the soil where the sowbugs and pillbugs live.

Chemical:

Generally cultural management practices, such as mulches and soil moisture management are the most effective in preventing sowbugs and pillbugs from becoming a problem.


Sources:

Figure 6.6, Joseph Berger, Bugwood.org