You don't need a penetrant for foliar sprays like 24d if you spray before 9am. Plants that utilize a heavy waxy coating to retain moisture do most of the respiration at night. During the day the breathing holes are closed tight.
A penetrant is for herbicides like Remedy that work when sprayed on.the stem. It all depends on how the herbicide works and how it moves through the plant. Not all herbicides travel through the vascular cambium.
A penetrant is for herbicides like Remedy that work when sprayed on.the stem. It all depends on how the herbicide works and how it moves through the plant. Not all herbicides travel through the vascular cambium.