Safer Caterpillar Killer 16oz Concentrate - Effective Organic Control

In this review of Safer Caterpillar Killer II Concentrate the bottom line is simple: this is for gardeners and small-scale growers who need a targeted, organic way to stop caterpillars like tomato hornworms without harming bees, birds or earthworms. The reviewer found it effective when used as directed, with larvae stopping feeding quickly after ingestion of the active bacterium. Because it is OMRI listed and can be applied up to the day of harvest, it is especially useful for those who need both safety and fast insect control.

Key Features

• Targeted action: Uses Bacillus Thuringiensis var. Kurstaki so damaged caterpillars stop feeding soon after ingesting the product.
• Safe for beneficials: When applied as directed it has no effect on birds, earthworms or beneficial insects, preserving pollinators and wildlife.
• Harvest-safe: Labeled for use up until the day of harvest, allowing late-season applications on edible crops.
• OMRI listed: Certified for organic production, making it suitable for organic gardeners and farmers.
• Broad control: Controls tent caterpillars, gypsy moths, cabbage loopers, tomato hornworms and other caterpillar-stage pests.
• Value pack: Sold as a six pack of 16oz concentrates, offering multiple applications across the season.

Who It's For

This product is aimed at home gardeners, small organic farms and community gardens dealing with caterpillar outbreaks on vegetables and ornamentals, especially where pollinator safety and harvest timing matter. It fits users who prefer biologically based controls over broad-spectrum chemical insecticides and need a concentrate to mix for multiple spray treatments.

It is less suitable for someone seeking a single ready-to-use bottle or for pest problems outside the caterpillar/lobber stages. Those with persistent, noncaterpillar pests or who require immediate knockdown of all insect types should consider a different, broader-spectrum solution.

Pros & Cons

Pros

• Highly effective against caterpillars and worms, with many customers noting rapid results within days.
• OMRI listed and safe for beneficial insects when used as directed, supporting organic practices.
• Can be used up to day of harvest, making it practical for edible crops near harvest time.
• Sold as a 6-pack of 16oz concentrate, which offers good value and multiple applications.

Cons

• Active bacterium breaks down in sunlight, so it must be applied late in the day or on cloudy days for best effectiveness.

Specifications

Product	16oz Caterpillar Killer II Concentrate - 6 pack
Active ingredient	Bacillus Thuringiensis var. Kurstaki (B.t.)
Target pests	Caterpillars, gypsy moth larvae, cabbage loopers, tomato hornworms
Use until harvest	Can be used up until day of harvest
Certification	OMRI listed for organic use
Package size	6 bottles of 16oz concentrate

Our Verdict

Safer Caterpillar Killer II is a strong choice for gardeners and small-scale producers who need a targeted, organic control for caterpillar pests without harming pollinators or wildlife. The OMRI listing, harvest-safe label and concentrated 6-pack format make it good value for repeated applications, provided users apply late in the day to avoid sunlight degradation.

Frequently Asked Questions

Can this be used on vegetables before harvest?
Yes, it is labeled for use up until the day of harvest, so it is safe for use on edible crops when directions are followed.

Will it harm bees or birds?
When used as directed it has no effect on birds, earthworms or beneficial insects, including bees, because it targets caterpillar larvae.

When should I apply for best results?
Apply in late afternoon or on cloudy days since the active bacterium breaks down in sunlight and timing improves effectiveness.