CYLAS FORMICARIUS PDF

Overview Origin The origin of Cylas formicarius is not definitely known, but it is thought it may have originated in Africa or India. Life Cycle Adults are ant-like, shiny, blue-black, snout beetles whose "waist" and legs are bright orange-red. They are about 0. Larvae are legless, white to cream colored with a pale brown head.

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Overview Origin The origin of Cylas formicarius is not definitely known, but it is thought it may have originated in Africa or India. Life Cycle Adults are ant-like, shiny, blue-black, snout beetles whose "waist" and legs are bright orange-red. They are about 0. Larvae are legless, white to cream colored with a pale brown head. Larvae are about 0.

Breeding is continuous throughout the winter, especially in potatoes in storage. Eggs are laid singly in small cavities eaten out in the stem or tuber. Eggs hatch in less than a week and larvae feed inside for two to three weeks. Pupation occurs in the potatoes. The pupal stage lasts about a week to 10 days. There can be as many as eight generations per year.

Distribution Cylas formicarius is found throughout the coastal plain of the Southeast from North Carolina to Texas. It also is found in Hawaii and Puerto Rico, and widely around the world in tropical regions. Control Efforts Insecticides, cutural practices and biological controls are being used or researched for control of this pest. Description When this species was first discovered in the new world, it was thought to be a new species and was named Cylas formicarius elegantulus.

Later research showed it was Cylas formicarius that had been introduced from the Old World. Adults are ant-like, shiny, blue-black, snout beetles whose "waist" and legs are bright orange-red. They are about 6 mm long. Larvae are about 9 mm long. Hosts Sweet potato, morning glory, and other plants of the same family.

Damage Larvae cause damage by burrowing through the stem and roots. Even slightly infested sweet potatoes are unfit for food. Heavily infested tubers are unfit even for stock feed. Life Cycle Breeding is continuous throughout the winter, especially in potatoes in storage.

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Cylas formicarius

Top of page Eggs are laid singly in cavities in the root or stems. Following egg deposition the egg hole is covered with a greyish mass which hardens to form a protective cap over the developing egg Reinhard, ; Gonzales, Cockerham et al. Larvae feed inside roots or stems where oviposition occurs for days during which they complete three larval instars Sherman and Tamashiro, Mullen found a larval development period of Gonzales found a larval period of 25 days under Philippines field conditions while Cockerham et al. Pupation takes place within the sweet potato roots or stems where larvae feed.

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Cylas Formicarius

Introduction Back to Top Sweetpotato weevil is the most serious pest of sweet potato, not only in the United States, but around the world. It causes damage in the field, in storage, and is of quarantine significance. It is inherently of interest to entomologists due to its strikingly colorful appearance and extremely long rostrum beak. Figure 1. Larvae of sweetpotato weevil, Cylas formicarius Fabricius.

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