Hazard symbols or warning symbols are recognisable symbols designed to warn about hazardous or dangerous materials, locations, or objects, including electric currents, poisons, and radioactivity. The use of hazard symbols is often regulated by law and directed by standards organizations.
A pothole is a depression in a road surface, usually asphalt pavement, where traffic has removed broken pieces of the pavement. It is usually the result of water in the underlying soil structure and traffic passing over the affected area.
Handicap parking signs are designed with bright colors and pictograms to clearly identify accommodations for those with disabilities or special needs.These are the most common assigned colors in the majority of states. Red placards are for people with temporary disabilities and are issued as temporary permits. ... Blue placards are for people with permanent disabilities, such as someone who requires a wheelchair or has lost the use of one or more limbs.
Wet floor signs are used to notify and/or remind people of slip and fall hazards in the immediate area. These hazards include the presence of liquid or other slippery substance on the walking surface as a result of routine cleaning, accidental spills, product leaks, or presence of inclement weather conditions.
All species of plants, wild and cultivated alike, are subject to disease. Although each species is susceptible to characteristic diseases, these are, in each case, relatively few in number. The dataset contains images of common plant diseases in pepper, tomato and potato.
The target spot of tomato is caused by the fungal pathogen Corynespora cassiicola.1 The disease occurs on field-grown tomatoes in tropical and subtropical regions of the world. Target spot infections reduce yield indirectly by reducing the photosynthetic area and directly by reducing the fruit’s marketability through fruit spots.
The two-spotted spider mite is the most common mite species that attack vegetable and fruit crops in New England. Spider mites can occur in tomato, eggplant, potato, vine crops such as melons, cucumbers, and other crops. Two-spotted spider mites are one of the most important pests of eggplant.
The primary host is potato, but P.infestans also can infect other solanaceous plants, including tomatoes, petunias, and hairy nightshade, that can act as source of inoculum to potato. The first symptoms of late blight in the field are small, light to dark green, circular to irregular-shaped water-soaked spots (Figure 1). These lesions usually appear first on the lower leaves. Lesions often begin to develop near the leaf tips or edges, where dew is retained the longest.