Pests and Diseases

12 Plant Disease Symptoms, Causes And Actionable Treatments

In this post you’ll figure out the most common 12 plant disease symptoms and the possible causes of them, as well as the proper ways of treatment. Keep reading to check out the table below.

The nutrients that plants require for healthy, strong development are rich in California’s soil. Unfortunately, no matter what soil they grow in, unhealthy-looking plants show symptoms that are comparable to common diseases.

Many California soils are acidic or alkaline, rather than neutral. This might prevent your plants from getting the minerals they require. Compost and organic components assist to neutralize your soil and release the minerals you require.

It is helpful to know the pH of your soil (7 is neutral) as this may account for some deficiencies. The cost of a home pH test key with tests for the important minerals ranges from $10 to $15, and it’s well worth it. On another page, we’ll look at mineral deficits…

Here are some common signs of stress in your garden and their causes.

12 Plant Disease Symptoms https://organicgardeningeek.com

12 Plant disease symptoms and their possible causes

The problem looks like:Possible causeControls or treatments
1. Low fruit yield, small fruit with poor tasteUneven MoistureWater properly during dry periods
Poor soil fertilityAdd compost, manures
Improper temperaturePlant at the correct time of year
2. Plants grow slowly and have light green leavesNot enough lightThin the plants, don’t plant in the shade
Weather too coolProtect with floating row covers, cloaches
Improper pHIf the pH is too high, add sulfur, aluminum sulfate, and peat moss.
Excess waterDon’t overwater; improve drainage with amendments or plant in raised beds
3. Seedlings do not emergeNot enough soil moistureSupply enough water; multiple applications may be needed in hot or windy conditions
Soil crustingApply a light layer of fine mulch; keep moist as above.
Damping-offdon’t overwater; avoid spraying water on plants; plant treated seed
Improper planting depthfollow packet instruction; use gentle watering techniques
Slow germination due to weatherCover beds in spring and fall to warm the soil (see note)
Root maggotsUse floating row covers to exclude insects; registered soil insecticide as a last resort.
Old seedUse seed marked for current year and season
4. Seedling wilt and fall overSoil too dryWater properly
Damping-off (a fungus)Don’t over-water or water from above; use sterile soil-less mix; use fungicide
CutwormsDestroy crop residues; keep weed-free, hand-pick a night with a flashlight
Root maggotsUse floating row covers for exclusion; soil insecticide
Old seedUse seed for the current season
5. Chewed seedlings, plants, fruitBirds, rodents, rabbitsFence garden or beds, floating row covers, wire mesh, netting
(or accept it and plant an additional row to share)
6. Leaves covered with tiny white spotsSpider mitesUse insecticidal soaps; registered miticides are available
Air pollutionRinse off leaves
7. Wilted plantsRoot rot (fungal disease)Don’t overwater; remove affected plant materials; rotate your crops
Vascular wilt – found primarily in tomato, potato, eggplant, and peppersPlant resistant varieties; solarize the soil; rotate to other crops.
Root-knot nematodesPlant resistant varieties; solarize the soil; rotate to other crops
Other root-feeding nematodesSolarize soil; have the soil analyzed for nematodes if the problem persists.
Water-logged soilImprove drainage; use raised beds; correct watering practices.
8. Yellow leaves, but not wiltedLack of one or more nutrientsTest soil; treat for deficiencies. This may include adjusting the pH
Not enough lightThin crowded plants
Move to a sunnier location
9. Brown, shriveled leaf edgesSoil is too dryCorrect watering practices
Saltwater damageSpa water can contain enough salts to burn foliage. Leak any areas where spas drain,
Chemical fertilizer burnBagged fertilizers are concentrated salts, as stated previously. To avoid concentrations, wash them deeply into the soil once more.
Potassium deficiencyTest soil first. Add compost, manure, or other potassium bearing fertilizer
Cold burnFloating row covers trap the soil’s heat and can protect from frost
10. White powdery growth on top of leavesPowdery Mildew, a fungusSome varieties are listed as resistant. Treat infected plants with Safer’s sulfur and a surfactant.
11. Leaves have spotted, or mosaic-like discolored patterns, puckered leaves, runty plantsVarious virus diseasesDispose of contaminated plant materials rather than composting them. Control weeds and insects by removing and composting nin-infect plant debris.
12. Curled, pucked, distorted leavesHerbicide injuryHerbicides can be carried away by even the tiniest breeze. So keep an eye out for neighbors spraying pesticides near you.
Virus diseasesDispose of contaminated plant materials rather than composting them. Control weeds and insects, and remove and compost non-infected plant waste.
AphidsSprays made of soap and dormant oil – but only in badly infected regions. To behave as a host crop for predatory insects, leave certain parts untreated. Ants in charge (they farm the aphids for their honeydew)

Here are additional source for types of plant diseases PDF to download.

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Sercan C.

I'm an agricultural consultant in Turkey. While keeping up with my business, I love to share new topics about organic gardening with awesome people.

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