What are these?
The insects in your photo are scentless plant bugs specifically (Niesthrea louisianica). Scentless plants bugs are insects belonging to the order of True Bugs (Hemiptera). They are related to stink bugs, but do not have the odor-producing scent gland. They are native insects and actually considered beneficial because they eat the seeds of the velvet leaf weed which is a major exotic weed of corn, soybeans, sorghum, and cotton.
They may be controlled by hand picking and drowning in soapy water or alcohol. If you choose to apply an insecticide, take care not to spray any of the open blooms and do not use a systemic insecticide which will harm pollinators. Here's a link for more information:http://davesgarden.com/guides/bf/go/4480/
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