Climate change has changed living conditions of species and disappeared several
species and conversely, appeared as risk of increasing “natural enemy”. In the past two years,
epidemics of brown and yellow bugs and twisted leaves in Mekong Delta has occurred more
complicatedly and affected intensive cultivation and multi-crops and reduced rice
productivity. In the North, the small leaf-wound worm in the winter-spring crop became
epidemic. At the highest, the damaged rice area increased up to 400,000 ha, considerably
impacting on productive output and expenses.