Abstract
Infection by the nematode Sulphuretylenchus elongatus (Massey) Nickle caused massive cellular necrosis in the internal organs of Scolytus ventralis LeConte, resulting in sterility, disruption of the digestive processes, and eventual death of the host. Cellular disintegration probably occurred through the secretion or excretion of toxins or the secretion of histolytic enzymes. Nematodes initially fed within the haemocoel, presumably on nutrients in the haemolymph, but invasion of the tissues was observed in the late stages of heavy infections. Sterility in females was induced at an earlier stage of infection and at lower nematode populations than in males. This phenomenon may have occurred through the direct effect of nutrient starvation on ovary development or through the effect of nutrient starvation and/or toxins on the endocrine control of ovary development.
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