Boxes to contain vole traps
Put traps inside lidded wooden box with small entry hole at side

Crocosmia brown leaves
Spider mites

Mites do not like wet.  Spray leaves with jet spray, keep moist.  Treat with Neem or Hort oil. Cut off dead leaves and remove.

Bearded Iris maintenance

Here's a good article on clean-up, fertilizing, borers, and if needed imidicloprid use on irises. Info here

Blueberry leaf drop: leaf scorch or leaf spot?
Leaf scorch bacteria (Xylella fastidiosa) Brown on leaf margins on some branches, leaf drop, shriveled fruit.  New spring growth may be chlorotic with purple spotting.  Remove infected plants.
Leaf spot fungus (Alternaria or Septoria)  Fruits shrivel. Small gray spots, brown borders. Can defoliate the bush. Use fungicide. I think it's this.  Info here
Mummyberry (Monilinia) Fruits shrivel up.  Remove and destroy fruits. Use fungicide.  I don't think it's this... Northblue is resistant and the berries don't get pink or grayish. Info here

Peony Botrytis
Crushed limestone (not powdered lime) around the crown will prevent botrytis
Garden Gate Note

Horticultural Oil (woody plants)
Aphids, Mites, Insect eggs, Scale also powdery mildew
Does not affect beneficial predator bugs which are bigger and faster
Coats & suffocates slow bugs like scale

Spray heavy (winter) oil in dormant season - March - when temps are 40 degrees, dry day
Spray light (summer) oil during growing season 
Traditional heavy horticultural spray oils have a viscosity of 100 to 200. If used indiscriminately on plant foliage, they can clog the pores on leaves and buds, cutting off respiration and killing the plant. Dormant oil sprays were designed to be used in fall through early spring on plants that have lost their leaves during the winter, primarily fruit trees. Applied to branches and stems while trees are leafless, the oil smothers insect eggs hidden in the bark.

Light horticultural oils are very effective insect controls because they can be used on foliage without harming trees even in the summer months. This newer type of oil, often called "superior" horticultural spray oil, is lighter and less viscous (60 to 70) than heavy oil and evaporates much more quickly from leaves and stems. Any common woody ornamental plant can tolerate a spray using a 2-percent solution of this oil, as long as the plant is healthy, soil moisture adequate, and the relative humidity creates conditions for fairly rapid evaporation of the oil.

Neem (woody plants)
Powdery Mildew, Leaf Spot, Aphids, Whiteflies, Mites, Beetles, Scale 

Black Eyed Susans: leaf spot
Angular leaf spot is prevalent on ‘Goldsturm.’ This bacterial disease starts with angular spots that appear water-soaked. They soon turn brown and may grow to cover entire leaves. Angular leaf spot starts at the bottom of the plant and works its way up the stem. Unlike fungal leaf spots, those caused by bacteria do not have dark dots inside. 

Cut back plants in fall after the first hard freeze, and destroy infected trimmings. Sterilize tools by dipping them in 70 percent alcohol and allowing them to air dry before using them on healthy plants. In spring, treat emerging plants with a copper-based fungicide such as Bordeaux mix, and make repeated applications.  Avoid overhead irrigation because splashing water spreads the bacteria. 

Replacing susceptible cultivars like ‘Goldsturm’ with more resistant ones is an excellent alternative to spraying.

Viburnum leaf beetle
> Viburnum most resistant to viburnum leaf beetle:
V. bodnantense, dawn
V. carlesii, Koreanspice
V. davidii David
V. x juddii Judd
V. plicatum, doublefile
V. plicatum tomentosum, doublefile
V. rhytidophyllum, leatherleaf
V. setigerum, tea
V. sieboldii, Siebold

Place damp, rolled up newspapers or small cardboard boxes (like a cereal box) in the garden area in the evening. Earwigs feed at night and look for a damp, sheltered spot to spend the day. You can pick up quite a few in the newspaper the next morning. 

Place shallow cat food or tuna cans with a little bit of vegetable oil as traps.
Place a sticky barrier, such as Tanglefoot, sticky tape or even petroleum jelly, at the base of woody plants. Earwigs are crawlers and they’ll get stuck in the sticky mess before they can get up the tree or shrub to cause damage.

Diatomaceous earth seems to deter them. Apply it to the soil and reapply in 1 week, if necessary.