AI-Powered Plant Disease Identifier

The BioLens AI model is trained on thousands of labelled plant disease and pest images and typically returns the correct diagnosis in the top 3 results. Accuracy is highest with clear, well-lit, close-up photos focused on the affected area. If the top result does not match, check the second and third — one of the three is usually correct.

BioLens identifies over 100 plant diseases and pests including fungal diseases (powdery mildew, anthracnose, rust disease, early blight, late blight, fusarium wilt, root rot), bacterial diseases (citrus canker, fire blight, bacterial canker, bacterial wilt, crown gall), viral diseases (mosaic virus, citrus greening), and insect pests (aphids, spider mites, whitefly, mealybugs, thrips, psyllids, scale insects, leaf miners, borers, beetles, and caterpillars).

Yes. BioLens Plant Disease Identifier is completely free with no account or payment required. Upload a photo and receive an instant AI diagnosis along with a link to the full disease guide covering symptoms, treatment, and prevention — all at no cost.

Use clear, well-lit close-up photos with the diseased area filling most of the frame. Avoid blurry images, heavy shadows, and cluttered backgrounds. Natural daylight produces the best results. For small pests like spider mites, aphids, or scale insects, zoom in as closely as possible. Multiple photos can be submitted separately if symptoms appear in different areas.

Improve air circulation around the affected plant and avoid overhead watering. Remove and bin heavily infected leaves promptly. Apply potassium bicarbonate, neem oil at 1%, or a sulphur-based fungicide spray weekly during active infection. For severe infestations, use a systemic fungicide containing myclobutanil or tebuconazole per label instructions. Prevention through adequate plant spacing and limiting excess nitrogen fertiliser is equally important.

Early aphid signs include distorted, curled, or cupped young leaves; a sticky, shiny honeydew glaze on leaf surfaces; dense clusters of tiny 1-3 mm pear-shaped insects on shoot tips and leaf undersides (green, black, brown, or yellow); ants actively tending the plant; and a growing grey bloom of sooty mould. Act early — aphid colonies can multiply ten-fold within a single week under warm conditions.

Early blight (Alternaria solani) appears first on older lower leaves as brown concentric ring target-like lesions with a yellow halo, developing in warm humid conditions. Late blight (Phytophthora infestans) causes large, irregular, water-soaked grey-green lesions that expand rapidly in cool, wet weather and can destroy an entire crop within days. Late blight is far more catastrophic — it is the same pathogen responsible for the Irish Potato Famine of 1845-1852.

Citrus greening (Huanglongbing/HLB) is spread exclusively by the Asian Citrus Psyllid (Diaphorina citri), which acquires the bacterium Candidatus Liberibacter asiaticus from infected trees and can transmit it within 30 minutes of feeding on a healthy tree. There is currently no cure for infected trees. Management requires controlling the psyllid vector using the parasitic wasp Tamarixia radiata, applying systemic insecticide soil drenches during new flush growth, and promptly removing and destroying confirmed HLB-infected trees to protect surrounding orchards.