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🌱 Defend your garden organically—because perfect harvests don’t wait!
Safer Brand Caterpillar Killer II Concentrate is a potent, OMRI Listed organic insecticide containing 98.35% Bacillus Thuringiensis var. Kurstaki. It effectively eliminates caterpillars, gypsy moth larvae, and tomato hornworms without harming beneficial insects or the environment. Safe for use up to the day of harvest, this 16 fl oz liquid concentrate offers professional-grade pest control tailored for organic gardeners seeking reliable, eco-conscious protection.










| ASIN | B00GVKZG8E |
| Active Ingredients | Bacillus Thuringiensis subspecies Kurstaki strain SA-12 solids, spores, and Lepidopteran active toxins 98.35%, Other Ingredients 1.65% |
| Best Sellers Rank | #18,713 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #109 in Insect & Pest Repellent Spray Concentrates |
| Brand Name | Safer |
| Customer Reviews | 4.5 4.5 out of 5 stars (3,088) |
| Global Trade Identification Number | 00024654516304 |
| Included Components | Safer Caterpillar Killer Multiple Insects 16 Oz |
| Item Form | Liquid |
| Item Type Name | Safer Brand 5163 Caterpillar Killer II Concentrate, 16 oz |
| Item Weight | 1.02 Pounds |
| Liquid Volume | 16 Fluid Ounces |
| Manufacturer | Safer |
| Model Number | 5163-6 |
| Part Number | 5163-6 |
| Target Species | Insects |
| UPC | 024654516304 |
| Unit Count | 16.0 Fluid Ounces |
| Warranty Description | Warranty |
N**N
Christmas In July thanks to Safer Brand 5163 Caterpillar Killer II Concentrate
UPDATE for 2020.... It's official. Not a SINGLE corn ear worm this year. Follow my review below and you'll never lose corn to that fish bait again! This stuff is dynamite! --------------------------------------------- If you have a problem with corn ear worms I hope you'll stick with this piece. It's my Christmas present to your garden. I have been planting corn in the same location for nearly 40 years so I know most of the tricks nature is liable to throw. This year I didn't have the perfect storm early in the season to leave the corn patch a tinkertoy mess. And we got enough rain and at the right time for a change so it was shaping up to be a great corn year. Corn, btw, gives the most ROI in growing pleasure. You really get a lot of bang for that little kernel. I LOVE just watching the stuff grow. Watching the honeybees at work etc. Love it! Anyway I always grow Golden Queen...which after years of experimentation works the best for me. This year I planted 5 rows, 60ft long. It's a back yard garden. Last year I bought Safer Brand 5163 Caterpillar Killer II Concentrate as an afterthought and sprayed at the corn a time or two and as usual 1/3 of the crop got gnawed. When shucking time comes normally on most of the ears I have to lop off the top....sometimes all the way to the middle. I live in corn worm heaven. Always have. We get very few perfect ears, and it's always a surprise when the queen ear of golden queen pops up un-gnawed. So I put most of the bottle into the fridge unused. Right next to the ketchup. Eyed that bottle all winter! This year I decided to go all out so at the first sign of silk I started spraying every other day up until about a week before harvest when I just got tired of doing it. Ha. Keep in mind that I was using the bottle I had held over a year in the refrigerator. I also sprayed my 32 tomato plants every other day. It may have knocked the horn worms back but not completely. In my case it probably didn't hurt but I eventually had to nuke them with a more lethal product. Put it that way. To be fair the jury is still out on tomatoes here. Back to the corn.... Last week I shucked out 162 ears on the first pick. Folks! I NEVER HAD SO MUCH FUN SHUCKING CORN! Out of that 162 I had to nip the tippy top out of 7 or 8 ears tops...and that looked to be from weevil chewing and not much of that. But out of 162 ears NOT ONE SINGLE EAR WORM!! Not a one! No sign. No worm. No nothing but ears of corn that looked like they came straight off the show room floor! Bam zoom zowie! Real state fair winners! Yesterday we did the second pick and out of that 50 not a single worm. It's unnatural! Normally the second pick is horrible! This time....only great pristine non chewed perfect ears! Bottom line I'd say that in my nearly 40 years I'll never top this corn harvest. BTW, I tried BT 30 years ago in powder form. Then I couldn't find it again for another 25. I always remembered that stuff and that's what prompted me to look for it again last year. Now it's all over the place. Safer Brand 5163 Caterpillar Killer II Concentrate really is concentrated. Even after all that spraying I still have some left over. Judging by my experience you could spray at least 600ft/row with two gallons made with two tablespoons. I may have practiced overkill, doing it every other day....but it WORKED. Why take chances? Spray at the first sign of silk... Even spray where you think the second ear may form if your corn puts on more than one ear. Do it every other day. And spray FROM THE TOP, making sure that some of the spray juice gets inside the ear. Do that and you will also have PERFECT corn and I don't care if you live in Ear Worm County. Spray nearly up to harvest. Get mean with that greedy fish bait. Do that and when you harvest you'll be thankin' me!
E**E
Great stuff in the battle of army worms, and fruit borers with eggplants and peppers
This stuff works it’s not a biohazard I have a small Pascal sprayer I have finally figured out how to keep the army worms off my egg plants and peppers you may have to reapply there if it rains but after a few applications you’ll notice that there’s no more fungus no more leaves cut off no more holes in your eggplants. Bravo this is a great solution to having all of your eggplants and peppers damaged. And it’s super easy to use. I keep my little hand sprayer loaded and spray my plants in my earth box after it rains
J**M
Works Pretty Good
Just what you need for your garden crawlers that are not invited to the harvest party.
S**Z
It works!!
Sprayed my oaks with the stuff using an attachment for my leaf blower. It worked and helped keep the caterpillar population down. Only downside, when it rains it washes off. But that’s to be expected.
P**C
Really Works on Outdoor Cannabis Plants
This is my second season of outdoor cannabis growing in containers . Last season I noticed caterpillars were the biggest advisory to a achieving a fully healthy plant. This product is a bacteria that kills caterpillars and other things like fungus and mold ( as they claim) . I literally had no issues with any bugs this year. It was an unusually good year in regard to hot dry weather so bugs were not in full swing. However moths were everywhere and I didn’t get one caterpillar or area if bud rot this harvest. I also grew same strain of cannabis this year and last both on same yard. I really feel this is an incredible resource to all growers. Hope they are as organic and no. Toxic as they claim
S**R
This product will kill caterpillars when used correctly. But ...
This product will kill caterpillars when used correctly. But therein lies the problem. Because it only kills them when they eat the leaves or flowers, and because it does not last long on the plant, you have to repeat use regularly. For me, that means once a week to keep the critters in check. And using a pump spray for all of my geraniums takes way too long to do it once a week all summer long. So if you have the time to reapply on a regular basis, and you want a safe spray that will only kill the buggers eating your plants, then this is the product for you. But if you want something long lasting that doesn't require reapplication regularly, look elsewhere.
Trustpilot
1 day ago
5 days ago