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Golden Tortoise Beetle

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Golden Tortoise Beetle


Golden Tortoise Beetle (Metriona bicolor), also known as gold bugs, are common in Northern United states.

Golden Tortoise Beetle

Golden Tortoise Beetle

Adults are broadly oval to round and nearly convex in shape with some sculpturing of the surface and the edges broadly expanded. They are green-gold with purple mottling and about 1/4-inch long. A few related species have similar metallic appearance and may feed on different host plants. The golden tortoise beetle, Charidotella sexpunctata bicolor (Fabricius), is brilliant brassy or greenish-gold in life.


Golden Tortoise Beetle change color depending on the availability of the liquid layer. In the fall and winter, the beetles become less lustrous and are more orange and bronze with flashes of iridescent color. If you try and collect the beetle for an insect collection, the beetle soon turns dark brown as is dries, loosing the golden color. The beetles are most beautiful left alive.


Life Cycle :Golden Tortoise Beetle Eggs are laid on leaves and the developing larvae feed on foliage, producing characteristic holes in the center of leaves. Tortoise beetle larvae are much less likely to be observed than the adults and have certain features that discourage closer inspection. Feeding on the underside of leaves, they are flattened, spiny insects with an elongated moveable fork at the end of the body. They also have an eversible anus that they use to deposit their excrement on the back, often mixed with old larval skins.


Golden Tortoise Beetle

Golden Tortoise Beetle

These “peddlars” then carry with them a sort of moveable parasol that covers the body and helps deter potential enemies. When full grown them pupate on the plant, where they undergo transformation to the ultimate adult form. The pupal stage is also covered with the old larval skin and fecal matter. Adults emerge after a week or two and feed during late summer. They do not reproduce at this time and subsequently go into winter dormancy, hiding among plant debris or in other sheltered sites.


Damage :Both larvae and adults feed on foliage. The typical form of injury is the creation of numerous small to medium-sized irregular holes. Both stages usually inhabit the lower surface, but eat entirely through the foliage. Rarely are tortoise beetles abundant enough to be considered damaging.


Management: Tortoise beetles are leaf feeders and do not usually affect sweet potato quality unless beetle numbers are excessive. Adequate fertilization, irrigation, and weed control are generally effective measures to compensate for leaf damage. Reduce or eliminate weeds of the morning glory family, such as morning glory and bindweed,from the garden and bordering areas.


Hand-picking and destruction of larvae and adults are labor-intensive but effective for reducing the population of tortoise beetles. Chemical control is generally not required for this pest. However, when the tortoise beetle population is high, 1–2 foliar applications of an insecticide may be needed to effectively manage these pests.


Golden Tortoise Beetle Damage

Golden Tortoise Beetle Damage

If you ever have any bug related questions feel free to call us either at Beyond Pest Control. Once again, and I can't stress this enough we are on call twenty four hours a day seven days a week to kill those bugs, we aren’t kidding whether you call us at 9 am or midnight we will be available to take your call and either get rid of the bug infestation, or answer any questions you may have concerning the bug issue. I can honestly guarantee that there will be someone to answer that call. We make it our business to make you bug free!


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