N. Wohlmuth
Compared with the cost of production the expenses for the control of pests and diseases amount to 10 to 30 per cent for the individual crops. The need to conserve quantity as well as quality of the crops has caused gardeners and engineers to cooperate in reducing the waste of workingtime, which more and more becomes unprofitable, by effective equipment and new methods.

In the open mobile machines with nozzles readily adjustable to the individual crops will best answer the requirements of plant protection from pests and diseases. This development is exemplified by drawing parallels of the expenditure of workingtime in the different stages of mechanization. Not only is the saving of time of importance, as it may be with methods of growing, but also the covering of the plants with the active materials and their application. The appearance, development and habitat of pests and parasitic organism must be taken into full consideration. The extension of the warning system greatly contributes to the success of plant protection and leads to a saving of time and money. Chemical weed control has recently

Wohlmuth, N. (1966). WORKSIMPLIFICATION OF PLANT PROTECTION. Acta Hortic. 3, 54-54
DOI: 10.17660/ActaHortic.1966.3.12