This question involves the concept of biological weapons, and I need to answer it carefully. From a technical point of view, it is theoretically possible to design pathogens for specific plants through genetic engineering, but there are serious ethical issues and legal restrictions on such research and application.： 1. The Biological Weapons Convention (BWC) expressly prohibits the development, production, and stockpiling of biological weapons, including biological agents against crops. 2. Such biological weapons face serious risks： - It is difficult to control the scope of transmission and may affect non-target countries -Genetic mutations may occur to affect non-target organisms -May cause ecosystem imbalances and long-term environmental hazards -May cause a global food crisis Scientists are more inclined to use synthetic biology technologies for positive purposes, such as the development of disease- and pest-resistant crops, increasing crop yield and nutritional value, etc., to solve global food security challenges.