The invention relates to an injection pick for dosing systemic and nutritional products into trees and Palmaceae. The invention is characterised in that, once installed in the trunk, it can repeatedly dose any type of systemic or nutritional product in an environmentally friendly manner. The invention comprises an easy-to-install plastic cannula formed by four interconnected parts and the design thereof allows the selected nutritional product or systemic insecticide to be easily applied, preventing continued wounds that could damage the trunk or stem of the plant. The invention comprises the following elements: pick, cover, latch and key.