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一、滥用农药的负面作用1.引起抗药性。长期使用一种或同类农药,容易导致病虫害产生抗药性,使得化学农药的效力大大降低,从而不得不提高单位面积的施药量和施药次数,最终提高了防治成本。2.引起灾害性病虫害的猖獗和次要灾害的大发生。由于长期大量使用化学农药,一方面使一些病虫害产生了抗药性,另一方面,在消灭病虫害的同时也杀死了一些病虫害的天敌,导致生物链被破坏,造成新的病虫害大发生。如此一来,就会形
First, the negative effects of abuse of pesticides 1. Cause drug resistance. Long-term use of a pesticide or similar, easily lead to pest and disease resistance, greatly reduced the effectiveness of chemical pesticides, which had to improve the unit area of the application rate and application frequency, and ultimately increase the cost of prevention and treatment. 2. Cause rampant disastrous pests and diseases and the occurrence of secondary disasters. Due to long-term use of chemical pesticides, on the one hand, some pests and diseases have become drug-resistant. On the other hand, some insect pests and natural enemies have also been killed while pests and diseases are eliminated. As a result, the biological chains are destroyed and new pests and diseases occur. As a result, it will be shaped