Category: Question of the Week
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Question of the Week – Squash Beetle Trenching
This week, the question was: Why is a portion of this squash leaf discolored? The light-colored tissue we see here is the result of squash beetle behavior known as “trenching.” Trenching cuts off (at least temporarily) the translocation of cucurbitacin defense compounds, to preserve the palatability and quality of the squash foliage feeding site. The beetles…
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Question of the Week – Large Leaf Spot
This week, the question was: What is wrong with this chestnut leaf? This leaf is showing symptoms of a fungal disease called large leaf spot (Monochaetia sp.) that affects oaks and chestnuts. The appropriately named spots may reach 2 inches wide and stretch across the entire leaf, killing large amounts of tissue. This disease is…
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Question of the Week – Bee Fly
This week, the question was: What is foraging in this cantaloupe flower? This little critter looks a lot like a bee (it’s yellow, fuzzy, and foraging flowers), but if you look closely, you’ll see it has only one pair of wings (bees have two). This feature distinguishes this as a fly, specifically a bee fly…
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Question of the Week – Paraquat Drift
This week, the question was: What are the spots on this squash leaf? These spots are from a small amount of paraquat drift that occurred while the adjacent field was being sprayed in preparation for planting. Paraquat is a contact-only herbicide, so this damage will not spread to new growth. This small amount of damage…
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Question of the Week – Unmanaged Apple Issues
This week, the question was: Can you name one problem with this apple? A quick glance at this ‘Gala’ apple shows signs of bitter rot, sooty blotch, and fly speck to name a few. The point of this question of the week is not really to name specific pests or pathogens but to talk about…
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Question of the Week – Hickory Horned Devil
This week, the question was: What is this wild-looking critter? This is a caterpillar known as the hickory horned devil. The adult is a beautiful moth known as the regal moth (Citheronia regalis), but it is rarely seen due to its nocturnal habit. The hickory horned devil commonly feeds on the leaves of walnut, hickory,…
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Question of the Week – Glyphosate
This week, the question was: What happened to this young tomato plant? This young tomato plant is suffering from glyphosate damage that occurred when row middles were being sprayed. Glyphosate is a systemic herbicide, so damage shows up at the growing point. At this stage of growth, it is unlikely the plant will grow out…
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Question of the Week – Giant Swallowtail Caterpillar
This week, the question was: What is on this citrus leaf? This looks a lot like bird poop, however, it’s just a camouflage tactic of the giant swallowtail caterpillar. This species is often called the “orangedog” as they feed on members of the citrus family throughout their larval stage. They can be a pest to…
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Question of the Week – Mantidfly
This week, the question was: What is the critter sitting on this eggplant leaf? This may look a lot like a paper wasp, but it is actually a mantidfly. If you look carefully, you’ll notice the front pair of legs is different from the two back pairs. The front legs look like those of a…
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Question of the Week – Black Swallowtail
This week, the question was: What will this caterpillar munching on dill grow up to be? This is the caterpillar of the Eastern black swallowtail butterfly (Papilio polyxenes). These caterpillars feed and develop on members of the carrot family, including dill, parsley, fennel, and celery. The black swallowtail is one of the more showy butterflies…
The South Carolina Grower 