• Enter your email address to follow this blog and receive notifications of new posts by email.

  • March garden tips & tasks

    If your fescue lawn looks a little skimpy, overseed early this month. Fescue grows best when the weather is still cool.

    Clip dead stems from perennial herbs – thyme, sage, lavender, rosemary. Pruning encourages vigorous new growth.

    Prune nandinas, flowering quince and other airy shrubs by reaching in and removing about a third of the branches at ground level.

    Remove mulch or leaves that may be covering perennials in garden beds.

    Prepare a new garden bed: Have the soil tested (check with your county’s Extension service). Remove grass and dig or till soil 8 to 10 inches deep and mix with soil amendments and organic matter to improve drainage.

    Add fertilizer lightly to perennials as soon as you see new growth. Too much fertilizer may result in lanky growth.

    Herb transplants that don’t mind cool weather -- parsley, cilantro, sage, oregano – can go in the ground now.

    When you cut daffodils to bring inside, cut the stems at an angle and place them in water right away. Change the water in the vase daily to keep them fresh longer.

    Save the date - Middle Tennessee garden events

    The Perennial Plant Society's annual Plant Sale will be April 8, opening at 9 a.m. at The Fairgrounds Nashville. The sale offers newly released and hard-to-find perennials from top local nurseries -- more than 450 varieties of perennials, vines, grasses, shrubs and annuals. The event supports local scholarships for Tennessee horticulture students and monthly gardening programs, open to the public, at Cheekwood Botanical Gardens. For information visit www.ppsmtn.org.

    The Herb Society of Nashville's annual Herb Sale will be April 29, 9 a.m. - 2 p.m. at The Fairgrounds Nashville. The sale will offer heirloom vegetables, rare varieties of perennial and annual herbs, handmade pottery herb markers and more. To learn more, visit herbsocietynashville.org.

  • Categories

  • Archives

What’s bugging the squash?

QUESTION: The leaves on some of my squash plants are beginning to wilt. Some of the small squash are rotting. What’s the reason?

squash gbWhen summer squash plants begin to go bad, you can probably blame it on insect pests. Two likely culprits: the squash bug and the squash vine borer.

“When squash leaves wilt and collapse, the squash bug is usually the pest to blame,” says extension agent David Cook. Squash bugs lay small, bronze-colored eggs on the undersides and upper surfaces of the leaves. Nymphs are gray with black legs, and are usually found in groups; adult squash bugs are broad and flat. They pierce the leaves and remove the sap, leaving the leaves wilted. You may also find them on cucumbers, melons and pumpkins.

The best control method is to be on the lookout for the eggs early in the season, and remove any that you find on the plants. (Organic Gardening magazine’s online pest control center suggests gently squishing them before they have a chance to hatch, and squishing any nymphs you may find, as
squash bug eggswell.) If you feel you must spray something, Cook says insecticides labeled for squash bug include bifenthrin, or permethrin. Always read and follow label directions.

If a long branch of the plant — or the entire plant — wilts suddenly, it’s the work of the squash vine borer, the larva of a moth that lays her eggs on the leaf stalks and vines. The eggs hatch in about a week, and the larva bores into the stem of the plant and begins to feed. If you look closely, you may find sawdust-like material near the base of the plant. To try to save the vine, split the stem open and remove the caterpillar. Mound soil up around the wound to encourage roots to grow.

After the larva enters the stem, insecticides are ineffective, so if you choose to use a chemical treatment, you have to start early. Cook says insecticides labeled for squash vine borer include bifenthrin, permethrin, carbaryl and esfenvalerate, and spinosad, which is considered a natural insecticide. Again, be sure to follow label instructions.

 

 

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: