Spider mite, SEM
Spider mite. Coloured scanning electron micrograph (SEM) of a spider mite (Tetranychus sp.). It is an economic pest and plant parasite, found on vegetable crops, fruit trees and flowers. It feeds on the leaf sap, which causes leaves to mottle, turn yellow and fall off. The spider mite is named due to its ability to spin a web, which it does across a leaf surface that secures and protects it against predators. Their numbers can be controlled with organophosphorus pesticide, although some resistance has developed. Another method is biological control, using a natural predator, such as gall midge larva (Feltiella acarisuga). Magnification: x135 at 6x7cm size.
© STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
Tobacco hornworm with tobacco plant
Tobacco hornworm (Manduca sexta) with a damaged tobacco plant, artwork. This species is common throughout North America. Eggs (right, lower) are laid on the underside of the leaves of the tobacco plant (Nicotiana sp.). These hatch into larvae (right, second from bottom) that feed on the plant. Although the nicotine in the leaves is toxic to many organisms, the hornworm larvae are able to sequester and secrete it. The damage to the plant by feeding larvae can be seen on the lower leaves. The larvae bury themselves in the ground to form a pupa (right, second from top). After about 18 days the adult moth (right, top) emerges.
© LIZZIE HARPER/SCIENCE PHOTO LIBRARY
Hungary, Pest County, Budapest, trams and crowd of passengers in front of rail terminus Budapest Nyugati palyaudvar and walking down steps to metro in foreground. Man appears to be begging on right hand side of steps, unacknowledged by passers-by.
© John Dakers / Eye Ubiquitous
Buda, Budapest, City, Commuters, Crowd, Crowded, Descend, East, Eastern, Europe, European, Hungarian, Hungary, Metro, Nyugati, Palyaudvar, Passengers, People, Pest, Rail, Station, Stop, Terminus, Tourists, Train, Tram, Transport, Travel, Underground