John & Bob's Blog

According to John: How To Rid Pesky Tomato Hornworms

Last week I was a guest on a gardening talk show and a listener asked about controlling tomato hornworms. The hosts were slightly incredulous when I mentioned that controlling tomato hornworms and all other pests and diseases not usually associated with soil quality, are directly related to the quality of your soil and a rich biodiversity of microbial life in the soil. The hosts asked, “How could applying John & Bob’s products impact the presence or absence of tomato hornworms?”


This is a fascinating question, unfortunately the answers are not simple and not completely understood by current science. An important factor is that 75% of all insect pests spend part of their life cycle in the soil and many of their natural enemies occur there as well (this happens to be the case with the tomato hornworm)as long as the...

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