Ciencia / Microbiologia- Protozoos

Microbiologia- Protozoos

Ensayos: Microbiologia- Protozoos
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Enviado por:  Rebecca  22 junio 2011
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ach other. A male carpenter bee has a white- or cream-colored spot on the head between mandibles and appears to have a white “nose” on the face. A female bee does not have the spot. Most of the congregating bees in the early spring are

males. They hover around waiting for the females and defending their territory. You can completely ignore the males because they are incapable of stinging, although

they will confront you whenever you enter their territory. sawdust underneath freshly

drilled holes. The sawdust is cast out while carpenter bees excavate tunnels. The third sign is the yellow or brown excrement stains on the sides of buildings underneath

entrance holes. Carpenter bees are usually nuisance pests, but can cause considerable structural damage from repeated colonization of the same area. Woodpeckers often peck through the wood surface of carpenter bees’ tunnels to prey

on the larvae inside, thus causing more severe damage. be present beneath the entry

hole and burrowing sounds may be heard from within the wood. Normally, the gallery will extend about 4 to 6 inches, but with repeated use, galleries may be

much longer.

Females lay their eggs within a series of small cells. After completing a tunnel, the female puts a ball of pollen moistened with nectar at the farthest point from the entrance hole and lays an egg on it. She seals off this cell with a thin wall of wood pulp and repeats the process. Eventually, the tunnel is partitioned into as many as four to eight cells. The egg hatches and the larva feeds on the food ball. Interestingly, adult bees emerge from pupae at nearly the same time within a nest, regardless of age. Adults then chew through the wall of the

Carpenter Bee

Infestation and

Economic Importance

Because carpenter bees nest in wood, they can cause aesthetic and structural damage. Common nesting sites include house siding, eaves, window trim, fascia boards, shingles, decks, fences, and outdoor furniture. The most distinguishing sign

of ca

rpenter bee infestation is the perfectly round ½-inch entrance holes bored into exposed exterior wooden surfaces (Figure 5). The holes lead to tunnels deeper in

the wood.

Life Cycle of

Carpenter Bees

Adult carpenter bees overwinter in old nest tunnels in which they have stored small amounts of pollen. Overwintering adults emerge and mate in spring. After mating, fertilized females either reinfest old tunnels or excavate new ones. The female bores into the wood perpendicular to the grain for about the length of her body, makes a sharp 90-degree turn, and tunnels parallel to the grain of the wood. The entrance hole and tunnels are perfectly round and about ½ inch in diameter. Coarse sawdust will often

Is Prevention Possible?

Bare, unpainted, or weathered softwood is especially attractive to carpenter bees. To prevent carpenter bee infestation, paint or varnish all wood surfaces. Apply two coats of a good exterior primer and follow up with at least one coat of finish. However, painting ...



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