May

General Maintenance Of Gardens

  • Wait until after May 15-20 to plant warm season crops and annuals
  • Protect warm season crops with covers if temperature falls into low 40s (floating row covers, hot caps, cardboard boxes)
  • Set out nesting boards for mason bees, drill holes 5/16th inch in diameter, as deep as drill bit (3-4 inches)
  • Watch for aphids, distorted leaves or honey dew, control with fish oil or soap
  • Get to know aphid predators
  • Watch for scale insects
  • Protect new plant growth from slugs, use traps or bait

Plant Specific

  • Thin carrots, beets, parsnips, turnips, and onions to about 3 inches between plants (eat thinnings)

Fruit Tree, General

  • Watch for scale insects
  • Spray for scab and mildew if weather moist for 6-8 hours, time dependent on temperature
  • Record bloom dates for all varieties
  • Thin fruit as soon as the fruit begins to swell
  • Monitor weeds for stink bugs and fruit for lygus bug damage

Fruit Tree, Specific

  • Apple and pear, set traps, pheromone or water/molasses for codling moth in apples and pears (see Appendix A for specifics)
  • Apple and pear scab, because of apple and pear scab behavior, if the weather is going to be dry for several days, spray the ground and old leaves with water to cause the scab spores to be released, since it is dry they will not germinate, thus reducing the scab potential when it rains and the tissues are moist
  • Apple and pear: Pink through petal fall; apple maggot; sticky red sphere traps with attractant
  • Apple and pear: 14-28 days after full bloom: codling moth, monitor with traps, timing is critical then control with Ryania & fish oil, Bt, codling moth virus, Trichogramma release monitor. Ryania, Bt, and codling moth virus all can be applied in a single spray
  • Apple and pear scab and mildew: 14-28 days after full bloom:
  • Bordeaux mixture, lime sulfur, sulfur, caution: lime sulfur, disrupts predatory mite populations
  • Apple: post bloom – continue monitoring weather for conditions favorable to scab, fire blight, powdery mildew – continue monitoring codling moth trap and check fruit – continue to examine shoots and leaves for aphids, leafhopper nymphs, tentiform leafminer and parasitism (April and June)
  • Cherry, set pheromone traps for cherry fruit fly
  • Cherry, brown rot, powdery mildew, apply wettable sulfur or Bordeaux mixture
  • Cherry, cultivate under tree to discourage brown rot, apply sulfur 20-10 days before harvest
  • Cherry fruit fly, try predatory nematodes under trees [if soil temperature 60°F (16°C)], keep soil moist, rotenone 5% (Caution: Broad Spectrum Killer) 7-10 days spray from mid-May to harvest.