Safer Brand Caterpillar Killer II Concentrate 16 oz Review

A 16 ounce BT kurstaki concentrate for organic-garden caterpillar, worm, and leaf-feeding insect spray routines.

Seller pricing varies Updated May 22, 2026

Bottom line

Safer Brand Caterpillar Killer II Concentrate gives organic-garden spray routines a 16 ounce BT kurstaki bottle for caterpillar and worm checks.

Safer Brand Caterpillar Killer II Concentrate 16 ounce bottle

What this review covers

The useful details are the 16 ounce concentrate size, BT kurstaki identity, OMRI-listed product framing, and measured sprayer routine.

The upside

  • The 16 ounce concentrate centers the routine on BT kurstaki for caterpillar and worm checks.
  • The product page lists OMRI use, which helps gardeners place it with organic-garden plant-care supplies.
  • The bottle pairs well with a dedicated sprayer, route notes, measuring tool, and rinse kit.

The tradeoffs

  • Concentrate use needs careful dilution, label reading, and clear sprayer marking.
  • Sun, rain, new growth, and active feeding can shape the follow-up rhythm.

Fit and feel

Good match:

This concentrate suits gardeners who want a BT kurstaki product for caterpillar and worm-control routines in organic garden care.

What to know:

Mark the sprayer clearly, write down the plant route, and keep leaf checks part of the routine after use.

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Full review

A BT kurstaki bottle for caterpillar checks

Safer Brand Caterpillar Killer II Concentrate is a 16 ounce bottle centered on BT kurstaki for caterpillar and worm spray routines. The product page lists OMRI use, so it fits naturally with gardeners who keep an organic-garden plant-care shelf.

The bottle belongs with a labeled sprayer, measuring tool, gloves, route notes, and rinse supplies.

Useful when leaf feeding is easy to see

BT products are easiest to plan when the garden already shows a clear route. Look for fresh chewing, frass, leaf folding, and the plant groups named on the product label. Then mix the sprayer for that marked plant route.

This keeps the spray session focused and makes follow-up checks simple.

Keep timing and cleanup steady

Sun, rain, watering, and new growth can affect the spray routine. Read the label for timing, then revisit the treated plants during regular leaf checks.

After spraying, rinse the sprayer parts and return the bottle to an upright, labeled storage spot.

Good match

This concentrate suits gardeners who want a BT kurstaki product for caterpillar and worm-control routines in organic garden care.

What to know

Mark the sprayer clearly, write down the plant route, and keep leaf checks part of the routine after use.