Hydrosensitive Paper (Spray Indicator Cards) - 10 Sheets - 2" x 4" Air Pump Accessories Number of Replaced Workers: 75

Number of Replaced Workers: 75

There is nothing to activate and nothing to refill

Grodan Gro-Smart Tray Insert The Grodan Gro-Smart Tray Insert is the ultimate solution for housing your Grodan Starter plugs

and match a sachet to that number

Hydrosensitive Paper (Spray Indicator Cards) - 10 Sheets - 2" x 4" Air Pump Accessories Number of Replaced Workers: 75Hydrosensitive Spray Indicator Cards for Coverage Checks A foliar or IPM spray only works where the droplets land, and the naked eye cannot see a thin, uneven coat until pests survive it. These cards make that coverage visible, turning the yellow paper blue everywhere a droplet hits. Clip a card in the canopy, run the sprayer, and read the blue stain for density, gaps, and drift at a glance. Each sheet is 2 by 4 inches, easy to pin on a leaf, a stake,