Cosmopolites sordidus

The adult banana root borer is about in length and has a glossy greyish-black or dark brown appearance. Unlike the billbugs (Sphenophorus), the thorax lacks depressions. The tibia of each of the limbs bears an accessory hook-like claw with which the insect clings to plants. The larva is plump and whitish with a reddish-brown head. The eighth abdominal segment of the larva bears a large spiracle, the remaining segments bearing small spiracles; the last two segments appear truncated, being fused together to form a plate-like structure. The pupa has an irregular appearance, with the developing wings and limbs being discernable through the pupal case. ==Distribution==

The banana root borer probably originated in southeastern Asia and Indonesia. It now has a cosmopolitan distribution and is found in all the banana-growing regions of the world: southern Asia, Africa, Macaronesia, Australia, South and Central America, the West Indies and Mexico. In the United States it is restricted to Monroe and Miami-Dade Counties in Florida. It is easily transported from one place to another in the larval stage, inside sections of root or corm. ==Ecology==

mites from Mindanao, Philippines Banana root borers feed on any species of Musa (banana), but they show a preference for plantains and East African Highland bananas (matoke) over dessert and brewing bananas. They are attracted to the host plants by the volatile chemicals given off, especially from damaged corms. They have been reported as feeding on Manila hemp, sugarcane and yams, but they probably only do this when they are unable to access banana plants. ==Damage==

The tunneling activities of the root borer weaken the stem, make the plant more susceptible to lodging, cause reduced uptake of nutrients, and result in crop damage and lower yields. Newly planted stands fail to thrive, and the damage increases over time. The adults are nocturnal, are poor fliers, and have low fecundity; their dispersal is limited. Planting insect-free roots or tissue culture plantlets may be effective for a few years before insects move in from surrounding areas. The removal and destruction of crop residues is another means of reducing damage from this pest and increasing yields. Another possible control method is attracting the adults with pheromones and trapping them. ==References==