STUDIES ON THE SECRETION OF DIASTASE AND INVERTASE BY EMPOA8CA SOLAN A DELONG (RHYNCHOTA, HOMOPTERA, JASSIDAE)

Abstract

S ummary . It has been shown that adults and nymphs of the Jassid, Empoasca solaria DeLong, are able to eject diastase into the feeding medium. This diastase, besides being secreted in the salivary glands, is apparently also formed by certain yeasts which are regurgitated from the gut of the insects. A technique is described for feeding the leaf‐hoppers on a liquid. The insects have also been shown to be capable of secreting an enzyme, probably invertase, which has the power of inverting pure sucrose.