Quad
four large bumblebee colonies) are developed for open-field crops, blossoming in spring. Crops Stone fruits, pome fruits, strawberry, blueberry. Mode of action [...] time collecting pollen to feed the brood. More workers emerge from the brood in the weeks after the introduction, increasing both colony size and pollination [...] After some weeks the colony will reach its maximum size and starts declining in size and pollination activity. Colony development depends on environmental