losses are caused both by direct effects of climate change on crops and
by increases in weeds.
Rising temperature will decrease yields of maize, soybean, wheat, rice and cotton, also specialty crops such as
almonds, grapes, berries, citrus, or stone fruits. Drought stress should
decrease the production of tomato, soybean, maize, and cotton.
Temperature increases will mainly affect the distribution of weeds by expanding their geographical range. This will
enhance further yield losses. Selection of cultivars that
secure high yields under climate change but also by competing with weeds is therefore
of major importance. Traits related with (a) increased root/shoot ratio, (b) vernalization
periods, (c) maturity, (d) regulation of node formation and/or internode
distance, (e) harvest index variations, and (f) allelopathy merit