| [receptivity of some helicids frequent in morocco to the infestation by the larvae of protostongylids. factors of variation (author's transl)]. | several species of helicids common on pasture in the rabat area were infected by a plurispecific mixture of larvae of protostrongylids. the fecal or pulmonary origin of the larvae does not seem to influence their infective ability. the age of the larvae used for infection displays an important role on the future degree of infection of molluscs: the young larvae are more infestive. the helicids that were most receptive to infection are, arranged in a decreasing order: otala lactea, cochlicella co ... | 1979 | 533113 |
| survival of sheep and goat first stage protostrongylid larvae in experimental conditions: influence of humidity and temperature. | the survival of first-stage larvae of a laboratory strain of muellerius capillaris and of a natural multispecific infection (neostrongylus linearis, cystocaulus nigrescens, protostrongylus rufescens) was studied for 10 to 12 day periods. the survival was estimated either on larvae in faeces or kept in tap water. temperature (-18 degrees c to 37 degrees c) and desiccation were the ecological factors investigated. m. capillaris was the most tolerant to these factors but showed better survival at 4 ... | 1991 | 1940250 |