Question

which of the methods described below is not part of an integrated pest management system? handpicking pests off plants tilling soil to remove weeds using boric acid controlling pests with the release of natural predators

Explanation:

Integrated Pest Management (IPM) emphasizes non - chemical, ecological, and preventive methods. Handpicking pests (mechanical), tilling soil to remove weeds (cultural/mechanical), and releasing natural predators (biological) are IPM - compatible. Using boric acid is a chemical method, and IPM minimizes chemical pesticides. So using boric acid is not part of IPM.

Answer:

Using boric acid