MEXICAN BEAN BEETLE

The mexican bean beetle, the most damaging pest of beans has been less numerous in recent years. The adults and larvae feed on the leaves, pods and stems and lead to death of the bean plant.
Eggs of the mexican bean beetle are laid on the underside of leaves. Hatch in 5-14 days and feed for 2-5 weeks. A generation last for about 30 days.
Description of mexican bean beetle is:
Adult- 1/3 inch long in yellow to yellow brown color. 8 black spots on each wing cover.
Eggs- a yellow-orange color in groups of about 40 on underside of the leaf.
Larvae- about 1/3 inch oval long. 6 rows black tipped spines on the backs. This stage does the most damage to the plants.
Pupa- yellow-orange in color attached to underside of leaves.
Besides garden beans, they will be found on cowpeas, soybeans, clover, black-eyed peas and alfalfa.
Mexican bean beetle is found throughout the USA now with the exception of California, Oregon and Washington. Damaged plants take on a skeletonized look after their feeding.
It is almost like this beetle is a blacksheep member of the family because most of its family are beneficial insects.
Organic control can be by:
Spined soldier bugs
Tachnid fly
Canola oil with pyrethrins -- an insecticide from plants for plants.Click here
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