In theory, it is possible to design pathogens or bacteria that specifically target specific plants through bioengineering technology. However, this approach involves multiple complex and ethical issues. 1. **Technical Challenges**: It is quite difficult to design a bacterium that can specifically recognize and destroy a specific crop. The wide variety of crops and the complex interactions between crops and the environment, other plants and microorganisms also increase the difficulty of achieving this goal. 2. **Risks and Uncontrollability**: Even if such bacteria can be successfully created, the ecological consequences they may cause are difficult to predict. Genetically modified organisms may inadvertently spread to non-target areas, affecting other plants and ecosystems, and bringing uncontrollable environmental crises. 3. **International Law and Ethical Issues**: According to international regulations such as the Biological Weapons Convention (BWC), the development or use of biological weapons is prohibited. Such behavior is considered an act of war that violates international law and is ethically unacceptable. 4. **Safety and Prevention**: If a country wants to use this technology to attack, other countries are likely to develop similar technologies to retaliate, leading to the escalation of biological warfare. This military use of biotechnology will not only endanger the target country, but may also threaten global agriculture and food security. In general, bioengineering should be used to improve agricultural production, increase food security and solve environmental problems, rather than being used as a weapon against other countries. The development of science and technology should always be aimed at promoting human welfare.