sentences:  In lab studies, neonicotinoids were shown to increase mortality rates.Separate from lethal and sublethal effects solely due to neonicotinoid exposure, neonicotinoids are also being explored with a combination with other factors, such as mites and pathogens, as potential causes of colony collapse disorder.Neonicotinoids may be responsible for detrimental effects on bumble bee colony growth and queen production.