Problem looks like:

Controls or treatments

 Low fruit yield, small fruit with poor taste

 Water properly during dry periods

 Poor soil fertility

 improper temperature

 Plant at the correct time of year

 Plants grow slowly and have light green leaves

Thin the plants, don't plant in the shade

 protect with floating row covers, cloaches

 Test the pH; if alkaline, add soil sulfur, aluminum sulfate, peat moss

Don't over water; improve drainage with amendments or plant in raised beds

 Seedlings do not emerge

 not enough soil moisture

 Supply enough water; multiple applications may be needed in hot or windy conditions

 apply light layer of fine mulch; keep moist as above.

 don't over water; avoid spraying water on plants; plant treated seed

 improper planting depth

 follow packet instruction; use gentle watering techniques

 slow germination due to weather

 Cover beds in spring and fall to warm the soil (see note)

 Use floating row covers to exclude insects; registered soil insecticide as last resort.

 Use seed marked for current year and season

 Seedling wilt and fall over

 damping-off (a fungus)

 Don't over-water or water from above; use sterile soil-less mix; use fungicide

 Destroy crop residues; keep weed free, hand-pick a night with flashlight

 Use floating row covers for exclusion; soil insecticide

 Use seed for current season

 chewed seedlings, plants, fruit

 birds, rodents, rabbits

 Fence garden or beds, floating row covers, wire mesh, netting
(or accept it and plant an additional row to share)

 leaves covered with tiny white spots

 Use insecticidal soaps; registered miticides are available

 rot rot (fungal disease)

 Don't over water; remove affected plant materials; rotate your crops

 Vascular wilt - found primarily in tomato, potato, eggplant and peppers

 Plant resistant varieties; solarize the soil; rotate to other crops.

 root knot nematodes

 Plant resistant varieties; solarize the soil; rotate to other crops

 other root-feeding nematodes

 Solarize soil; have the soil analyzed for nematodes if problem persists.

 water-logged soil

 Improve drainage; use raised beds; correct watering practices.

 yellow leaves, but not wilted

 lack of one or more nutrients

 Test soil; treat for deficiencies. This may include adjusting the pH

 Thin crowded plants

 Move to sunnier location

 brown, shriveled leaf edges

 Correct watering practices

 salt water damage

 Spa water can contain enogh salts to burn foliage. leak any areas where spas drain,

 Chemical fertilizer burn

 Same as above - bagged fertilizers are concentrated salts. Wash these deeply into the soil to avoid concentrations.

 Potassium deficiency

 Test soil first. Add compost, manure or other potassium bearing fertilizer

 Floating row covers trap the soils heat and cn protect from frost

 White powdery growth on top of leaves

 Powdery Mildew, a fungus

 Some varieties are listed as resistant. Treat infected plants with Safer's sulfur and a surfactant.

 Leaves have spotted or mosaic-like discolored patterns, puckered leaves, runty plants

 Various virus diseases

Remove infected plant materials - do not compost them Remove and compost nin-infect plant materials, control weeds, insects (See IPM listing in resources page)

 Curled, pucked, distorted leaves

 Herbicides drift on the slightest breeze. Be careful of neighbors dispensing herbicides upwind of you.

Remove infect plant materials - do not compost it. Remove and compost non-infected plant materials, control weeds, insects (See IPM listing in resources page)

Soap-based sprays, dormant oil sprays - but only in heavily infested areas. Leave some areas untreated to act as a host crop for predatory insects. Control ants (they farm the aphids for their honeydew)