The word: antagonists can be found in:

An Ecological and Societal Approach to Biological Control

Biochemical Targets of Plant Bioactive Compounds: A Pharmacological Reference Guide to Sites of Action and Biological Effects

Ethylene Action in Plants

Handbook of Biologically Active Peptides

Insect Ecology, 3rd Edition (Wiley)

Mycotoxins and Food Safety

Natural Enemies - An Introduction to Biological Control

Nematology: Advances and Perspectives Vol 1: Nematode Morphology, Physiology and Ecology

The Biology of Marijuana: From Gene to Behavior

The Nature and Practice of Biological Control of Plant Pathogens

Keyword: antagonists