9/1/2023 0 Comments Tomato leaf blightTomato diseases are caused by several factors, including fungal, bacterial and viral infections 1, 2, 3, 4. However, a series of diseases has threatened tomato production in Florida, resulting in large losses in fresh and processed tomato production. According to data from the US Department of Agriculture, Florida is the leading state in fresh-market tomato production. Further work may incorporate the proposed technique into an image system that can be operated to monitor multi-diseased tomato plants in fields.įresh-market tomatoes are produced in every state in the US, where 20 states support commercial-scale production. Late stage leaves could be distinguished more easily than the two other disease categories caused by similar symptoms on the multi-diseased leaves. Amongst the examined leaves, the healthy ones had the highest accuracy (100%) and the lowest error rate (0) because of their uniform tissues. SVIs with weight coefficients ranking from 1 to 30 in each selected PC were applied to a K-nearest neighbour for classification. Results revealed six principal components (PCs) whose eigenvalues were greater than 1. Principal component analysis was conducted to evaluate SVIs. Fifty-seven spectral vegetation indices (SVIs) were calculated in accordance with methods published in previous studies and established in this study. One healthy leaf and three diseased tomato leaves ( late blight, target and bacterial spots) were defined into four stages (healthy, asymptomatic, early stage and late stage) and collected from a field. In this study, a high-resolution portable spectral sensor was used to investigate the feasibility of detecting multi-diseased tomato leaves in different stages, including early or asymptomatic stages. ![]() Several diseases have threatened tomato production in Florida, resulting in large losses, especially in fresh markets.
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