Egg-to-adult developmental times of Hemiptarsenus varicornis females and males at 25°C were 8.8 days and 8.6 days on Liriomyza trifolii, and 9.0 days and 8.8 days on L. bryoniae, respectively. The estimated lower threshold temperatures for development of the parasitoid females and males were 8.5 and 8.9°C on L. trifolii, and 8.4 and 8.2°C on L. bryoniae, respectively.
Two distinct waveforms were confirmed to correspond to ingestion from vessel and from phloem, by electro-physiological measurement and examination of salivary sheaths. Another characteristic waveform described as trial phloem feeding was shown to be an indication of actual ingestion from phloem. There was no significant difference in distribution patterns of salivary sheath between rice cultivars. Concentrations of some amino acids, especially aspartic acid, serine, glutamic acid, and arginine, were remarkably lower in the phloem sap of resistant varieties than susceptible varieties.