Defender

Most likely, Scott Systemic Defender is a plant protection product made to offer systemic defence against various threats like pests, fungi, and other dangerous substances. The word “systemic” refers to the way the substance is taken up by the plant and distributed throughout its tissues, providing internal defence against current illnesses or averting new ones.

If it’s a fungicide, it may prevent illnesses like rust, black spot, and powdery mildew by preventing the growth of fungus pathogens. If it’s an insecticide, it may be absorbed by pests while they feed on the plant, protecting against them and eventually eliminating or discouraging them.