April 16 (Reuters) - Global biotech seed giant Monsanto Co and rival Bayer CropScience said Tuesday they have signed a series of cross-licensing deals to share certain crop biotechnology for weed and pest control. Monsanto said it will provide Bayer CropScience , a subsidiary of Bayer AG of Germany, with a royalty-bearing license to herbicide-tolerant soybean technology known as Genuity Roundup Ready 2 Yield and Genuity Roundup Ready 2 Xtend technology in the United States and Canada. Bayer CropScience also will receive a royalty-bearing license to use Monsanto's Intacta RR2 PRO, an insect-protected soybean, in Brazil with an option to a royalty-bearing license in other Latin-American countries in the future. Bayer CropScience will be able to stack the genetic traits with other traits in the crops it develops under certain conditions. In return, Bayer CropScience will grant Monsanto licenses to evaluate some of its own technologies for controlling corn rootworm pests and for making crops that are herbicide tolerant. Financial terms of the deals were not disclosed. On April 11, Monsanto announced a similar cross-licensing arrangement with Dow AgroSciences, a subsidiary of Dow Chemical. In that deal, Monsanto is licensing Dow AgroSciences' new Enlist Weed Control System herbicide-tolerant trait for use in field corn. And Dow AgroSciences is licensing Monsanto corn rootworm technology that is under development. Monsanto's Roundup Ready crop technology has been a popular platform for soybeans, corn, cotton and other crops, giving farmers the ability to kill weeds without harming the herbicide-tolerant crops when they spray their fields with Roundup herbicide. But heavy use of Roundup has spurred expansion of Roundup resistant weeds, and Monsanto and other agricultural biotech companies have been working to come up with new combinations of chemicals to try to fight back weed resistance. Insect resistance is also a growing concern in some areas.