A computer power supply includes a standby voltage output terminal to output a standby voltage, a power connector connected to the standby voltage output terminal, and a standby voltage discharge circuit including a zener diode, first and second electrical switches. A guide device, fixed to the reference device, enables the apparatus to engage a crankpin, in the course of the orbital motion of the crankpin, and limit the displacements of the first arm and those of the second arm when a control device displaces the apparatus to a rest position. Soybean plants that display tolerance or improved tolerance to Fusarium solani infection that are generated by the methods of the invention are also a feature of the invention.