The invention relates to the use of riboflavin and of flavin derivatives with chitinase-inhibitory action for controlling arthropods, nematodes and chitin-containing fungi. In one embodiment, the annealing source is a self-heating structure that is a Si-containing resistor that is located side by side with an emitter of the bipolar transistor. A plurality of wires are each connected to a respective one of the plurality of conductor terminals and a plurality of phase lead connection terminals are each connected to at least one of the plurality of wires. The boot contacts and scrapes the opener disc and creates an enclosure between the boot and the opener disc.