GARDEN NEWSLETTER: Rain, Sawfly Larvae, Cucumber Recipe and More - GardensAll (2024)

We wanted rain and when it finally came, it poured… and poured… and poured some more! Then we saw the sawfly.

What a week! Our gardenrain gauge showed nearly 5 inches after 3 days of thunderstorms. Thursday, it began to dry out and we applied Serenade fungus spray to our tomatoes and Dipel to the kale, cabbage and broccoli. Opportunistic cabbage worms had gone right back to work on the leaves once the rains had done away with the last treatment of powder.

Audio Article:Rain, Sawfly Larvae, Cucumber Recipe and More

Sawfly Larvae Infesting our Dogwood

Dipel Bt to the Rescue… Again!

Speaking of wormy-like pests, we discovered an infestation of sawfly larvas—those fuzzy white crawlies that look like caterpillars—on our red twig dogwood bush. As you can see, they consumed about 50% of the leaves before we spied them. Being organic-based growers, the only thing we had on hand was Dipel which was liberally applied. Experts claim Dipel and other forms of Bt are ineffective in controlling sawfly larvas. This is because they aren’t true caterpillars, but rather a sort of stingless wasp.But Dipel was all we had. Well, lo and behold: The second photo is about two hours later. By the end of the day, they were all gone!

We applied Dipel (Bacillus thuringiensis or Bt) and by the end of the day, the dogwood sawfly larvae infestation was gone.
~Coleman Alderson,

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Dipel (Bacillus thuringiensis or Bt)

How Dipel Insecticide Works

Dipel (Bacillus thuringiensis or Bt) packs a one-two punch. It contains protein crystals that scour the inner lining of the caterpillar as it feeds. Dipel spores then enter the lesioned gut wall and spread rapidly through the system causing blood poisoning. The larvae stops eating in a few minutes and dies within 1-3 days. [1] How or why it affected the sawfly larvas is a mystery, but, hey, we’ll gladly accept this exception.

How to Apply Dipel Dust

We use both liquid and powdered typed of Dipel Bt. The best way we’ve found to apply the powder as a fine dust is with an old nylon stocking filled with the stuff and lightly jiggled over the plant. We tie ours off at the end of an old broomstick for an extended reach.

Tomatoes Split and Cracked (As Expected)

Sure enough, we found a handful of tomatoes that had splits and cracks due to the heavy rains. We covered this prospect in our last newsletter. Thankfully, most of our crop is still green. We sorted through the ones we picked, tossed a couple that already had ants and sow bugs, wound up with three quasi-ripe tomatoes. One has already turned bad and the two remaining will be cut up for soup today. Win some, lose some, and make some soup!

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Got Loads of Cukes? Try This!

By the way, we tried out a new recipe that used up a large bin of garden cucumbers: cucumber soup made with a blender and served cold. Man! Is it delicious!

Cold Cucumber Yogurt Soup Recipe

We didn’t have all the ingredients on hand, such as fresh tarragon, dill and shallots, so that below is adapted from the original recipe[2]


  • Oversized pickle cucumbers (2 1/4 pounds), halved-any cucumber variety will do
  • 1 1/2 cups plain organic yogurt
  • 3 tablespoons fresh organic lemon juice
  • 1 garlic clove
  • 1/2 medium red onion, chopped
  • 1/3 cup loosely packed fresh dill (or ~1/4 cup dried)
  • 1/4 cup fresh curly parsley, finely chopped
  • 2 tablespoons loosely packed tarragon leaves (or 1 Tbsp dry)
  • 1/4 cup organic olive oil
  • 1 teaspoon salt (or to taste)

Step 1

In a blender*, combine the chopped cucumber with the yogurt, lemon juice, onion, garlic, dill, parsley, tarragon and the 1/4 cup of olive oil. Blend until smooth. Season with salt and pepper, cover and refrigerate for at least 8 hours or overnight.

We use a Vitamix that we’ve had for years and we refrigerate the soup in the blender pitcher so that we can give it another blending just before serving.

Step 2

Taste and add additional seasonings as needed, give it another whir in the blender, then pour the soup into bowls. Garnish with the finely sliced or diced cucumber, red onion, a sprig of parsley or dill, and a drizzle of olive oil and serve.

And of course this recipe is very adaptable to whatever seasonings and herbs you have on hand.

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Rained Out

It’s been a short gardening week due to our three days of rain. We hope any of you experiencing this dry hot spell also saw some relief. We’re back to gardening in a steam sauna now. As the weatherman says, “Enjoy the weather ’cause it’s the only weather you got!”

Have you anything to share about your week? Are you a fan of Dipel or other “biotics”? You can post comments and/or photos up on our Facebook page, or send us an email. We love to hear from you and learn what you’re doing and your wins and lessons.

May your gardens flourish and your harvests be bountiful, and when you look upon your little Eden, may you see that it is good.
~Coleman Alderson,

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Tally hoe!

~ Coleman for

Keep on Growing!

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Coleman Alderson

G. Coleman Alderson is an entrepreneur, land manager, investor, gardener, and author of the novel, Mountain Whispers: Days Without Sun. Coleman holds an MS from Penn State where his thesis centered on horticulture, park planning, design, and maintenance. He’s a member of the Phi Kappa Phi Honor Society and a licensed building contractor for 27 years. “But nothing surpasses my 40 years of lessons from the field and garden. And in the garden, as in life, it’s always interesting because those lessons never end!” Coleman Alderson


The information on this website has not been evaluated by the Food & Drug Administration or any other medical body. We do not aim to diagnose, treat, cure or prevent any illness or disease. Information is shared for educational purposes only. You must consult your doctor before acting on any content on this website, especially if you are pregnant, nursing, taking medication, or have a medical condition. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Pages on this site may include affiliate links to Amazon and its affiliate sites on which the owner of this website will make a referral commission.
GARDEN NEWSLETTER: Rain, Sawfly Larvae, Cucumber Recipe and More - GardensAll (2024)


What kills sawfly larvae? ›

Examples of contact residual pesticides that are effective include permethrin, bifenthrin, lambda cyhalothrin, and carbaryl are most effective against young sawfly larvae.

How do you get rid of sawfly larvae in Australia? ›

When sawfly larvae are young, a strong spray of water from the hose will wash them to the ground, where they perish. Insecticidal soap is also highly effective against sawflies.

What is a home remedy for sawflies? ›

Apply food-grade Diatomaceous Earth for long-lasting protection. Made up of tiny fossilized aquatic organisms, that look like broken glass under the microscope, DE kills by scoring an insect's outer layer as it crawls over the fine powder. Contains NO toxic poisons!

What is the best spray for sawfly larvae? ›

The combination of Insecticidal Soap and Botanical Pyrethrins will kill Sawfly Larvae on contact if they are spotted in your trees. Azadirachtin is also an effective control for Sawfly Larvae.


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