Greenhouse Update - June 5, 2006
Leanne Pundt, Extension Educator, University of Connecticut
Spittlebugs – and their damage have been occurring on various herbaceous perennials and herbs as they move in from grassy areas surrounding protection areas. Look for the white foam surrounding the small, light green spittlebug nymphs. This foam helps the nymphs stay moist during hot, sunny conditions and protects them from predators. Most of the damage is only cosmetic due to the spittle masses. With small infestations, a forceful jet of water can be used to dislodge the nymphs.
Tortoise Beetles – are fairly small, (less than ¼ of an inch long), turtle-shaped beetles that can be dull orange, green or shiny gold – like a piece of jewelry. They can be found feeding on plants in the morning glory family such as Morning Glory, Moon flower, Cardinal Climber and Sweet Potato Vine – especially the variety Marguerite. Look for distinct round holes on the leaves of susceptible plants. If left unchecked, leaves will be riddled with holes as both the adults and larvae will feed on the leaves. Insecticides labeled for leaf-feeding beetles such as Orthene or Conserve may be used. Marathon (imidacloprid) may also provide control when applied as a systemic.
Leanne Pundt photos -- click for a larger image
Daylily Leaf Streak – is occurring on susceptible cultivars of Hemerocallis. Look for a central yellow streak along the leaf midvein that often starts at the tip of the leaves. Small, reddish brown flecks and brown sunken spots develop on sunken tissue. Proper plant spacing, and watering early in the day helps to keep leaves dry. Several different fungicides are labeled for leaf spot diseases including thiophanate methyl (Cleary's 3336 or Fungo Flo), myclobutanil (Eagle), or chlorothalonil (Daconil, Pathguard) or azoxystrobin (Heritage). At the end of the season, remove infected leaf debris. Do not confuse this fungus disease with Daylily Rust.
Septoria Leaf Spot – has been occurring on susceptible cultivars of Phlox. Look for grayish leaf spots with black, pepper-like spore cases that are surrounded by a purple border. Infections often begin on the lower leaves and move up the stem. Cultural practices used to manage Botrytis blight will also help manage leaf spots. Protectant fungicides containing chlorothalonil, mancozeb will also help.
Plan on starting preventative applications of labeled fungicides on Rudbeckia for Septoria Leaf Spot starting in mid- June.
Previous 2006 UConn IPM Greenhouse Updates
|May 22, 2006|
|May 9, 2006|
|May 1, 2006|
|April 24, 2006|
|April 15, 2006|
|April 10, 2006|
|April 3, 2006|
|March 27, 2006|
|March 20, 2006|
|March 3, 2006|
|February 25, 2006|
|February 17, 2006|
|January 31, 2006|
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