Controlling Crabgrass & White Bugs On Trumpet Vine Leaves

Question:

 I’ve been applying a ‘Weed and Feed’  to kill the Crabgrass in my lawn, but it has been ineffective. Should I dig the Crabgrass out or is there another type of product that will kill it?

Answer:

There isn’t a ‘Weed and Feed’ that kills the actively growing Crabgrass in a turf.
  • Weed and Feed' products control broadleaf weeds such as Dandelions, Spurge, Clover, etc., and not grasses. Although, you’ll find ‘Weed and Feed’ type products that kill the dormant seeds and they're applied January through March. Also, liquid herbicides are available that will control the actively growing, Crabgrass.
  • But, before I’d apply any herbicide, I'd first determine what the problem grass is. Crabgrass’ is used generically today to describe a wide variety of undesirable grasses.
    • I'd take a two-inch by two-inch sample of the grass to your favorite garden center and have a nursery professional give you a second opinion.
  • Once the problem is known, then the appropriate control can be prescribed. You might be surprised to discover that the offending grass is some other type of perennial grass. In which case, a crabgrass control is ineffective.
  • Bayer Advanced and Bonide are two of several brands that have liquid controls for Crabgrass. These products are selective herbicide, so they will not damage the desirable turf.
  • Also manually, removing the patches can be labor intensive, and you might not get it all. So you’ll be back at it again and again because of their deep roots.

Note:

Crabgrass is an annual weed. In the late summer or early fall it forms seed heads, and by Thanksgiving, it disappears leaving bare spots. This separate Crabgrass from many other types weeds that are evergreen or goes dormant and turns brown. So If it’s visible during the winter months, your problem is definitely not crabgrass.

Question:

The leaves on my Trumpet Vine have white insects and a gooey substance on them.  I used a hose to wash the insect and gooey stuff away but to no avail.  Also, the vine has stop flowering,  doesn’t appear to be growing, and the leaves are turning yellow and falling off.  What should I be doing to change things?

Answer:

Whitefly may be the insect problem but only if they are mobile when you touch the leaves.  I think your bugs are dead Aphids.
  • The sticky stuff is the secretions from the insect sucking on the new growth. The sticky stuff is not going away, and you might even get some Black Mold growing on it.
    • Aphids are a problem in the spring and are gone by June. We can see them again in the fall on a few plants such as Camellias.
  • I'd control them with Insecticidal Soap or Horticultural Oil when they are present as washing them off is not a great solution. The lack of growth, no flowers, and usually yellow leaves are not related to an insect problem.
  • I'd check the watering, and feed it with an organic all purpose fertilizer.
  • Also,  the original ball of soil should be at the soil surface and not buried too deep