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What goes wrong with tomato in Jamaican conditions, how to recognise it early, and what the crop needs at each stage. 7 common problems covered.
| Plant family | Solanaceae |
|---|---|
| Target soil pH | 6 – 6.8 |
| Seedling stage | Transplant to day 14 |
| Vegetative stage | To day 40 |
| Flowering stage | To day 60 |
| Typical yield | 1.5 lbs per plant |
| Harvest | Continuous — pick repeatedly over the season |
Fungal disease (Alternaria) starting on lower older leaves, characterized by concentric ring lesions.
Signs to look forHighly destructive oomycete (Phytophthora infestans) that can destroy a crop in days under cool, wet conditions.
Signs to look forA physiological disorder caused by a lack of calcium reaching the fruit, usually triggered by inconsistent watering.
Signs to look forDevastating viral disease transmitted exclusively by whiteflies, leading to severe stunting.
Signs to look forSmall white winged insects that congregate on leaf undersides, vectoring TYLCV and PRSV.
Signs to look forTiny arachnids that explode in population during hot, dry weather.
Signs to look forMassive green caterpillars that can defoliate a plant overnight.
Signs to look for| Stage | Nutrition | Why |
|---|---|---|
| Seedling | High Phosphorus starter (e.g. 12-24-12) | Establish roots quickly. Apply starter solution high in phosphorus to avoid transplant shock. |
| Vegetative | Balanced NPK + Magnesium (e.g. 20-20-20 + Mg) | Support vigorous stem and leaf growth. Keep nitrogen levels steady to avoid excessive vine growth at the expense of fruit. |
| Flowering | Calcium-Rich Formula (e.g. Calcium Nitrate + CalMax) | Crucial stage. Apply calcium nitrate and foliar calcium (CalMax) to prevent Blossom End Rot (BER) as flowers set. |
| Fruiting | High Potassium & Calcium (e.g. 12-12-36) | Boost fruit sizing and sugars with potassium. Keep watering consistent to prevent fruit splitting. |
The problems growers report most often are Early Blight, Late Blight, Blossom End Rot, Tomato Yellow Leaf Curl Virus (TYLCV), Whiteflies, Spider Mites, Hornworms. Each one is described above with the symptoms to look for and the recommended response.
Tomato performs best in soil with a pH between 6 and 6.8. Outside that range nutrients become progressively less available to the plant even when they are present in the soil.
Counting from transplant, the seedling stage runs to about day 14, vegetative growth to about day 40, and flowering to about day 60, after which the crop moves into fruiting or bulking.
PlantArmor keeps your tomato spray records, input costs and harvest weights in one place, and works offline while you are out in the field. Free to use.
Pest descriptions and treatments above come from the same reference library the PlantArmor app uses in the field. Pesticide registrations and permitted uses change — always read the current product label and observe the stated rate, re-entry period and pre-harvest interval.