ISHS Acta Horticulturae 153: IX African Symposium on Horticultural Crops
BIO-ECOLOGICAL FACTS ON LIRIOMYZA TRIFOLI BURGESS (DIPT., AGROMYZIDAE) AND ON ITS PRINCIPAL PARASITE HEMIPTARSENUS SEMIALBICLAVA GIRAULT (HYM., EULOPHIDAE) |
| Authors: | B. Vercambre, A. Thiery |
| Keywords: | Liriomyza trifolii, Hemiptarsenus semialbiclava, cyclus, zero development, parasitic capacity, Reunion Island |
| Abstract:
The life cycles of Liriomyza trifolii and its principal parasite Hemiptarsenus semialbiclava have been studied in a climate-controlled room. The french bean (Phaseolus vulgaris L.) has been used as a host plant. The insect cycles change from 61, 23, 17 to 15 days with respective temperatures of 15, 20, 25 and 30°C. For the parasite these figures are 16,5 – 11,5 – 8,5 and 6,5 days with temperatures of 20, 25, 30 and 35°C. At 7–8°C there is no development in L. Trifolii while in H. semial-biclava no changes occur at 13–14°C. The effect of the parasite has been studied in cages with 20 couples of Hemiptarsenus which daily met with 80 larva at larval stage 3 of Liriomyza. A female of the parasite will lay on an average, one egg in 85% of the insects. A female will produce about 65 eggs. About 61% of control can be obtained. Although Liriomyza adapts better to the Réunion conditions than the parasite, the shorter life cycle of the parasite serves to compensate for this and a good control is obtained at temperatures between 20–30°C. It is unnecessary to introduce a competitive parasite but there is a particular need for parasites in the L1 and L2 larval stages. | |
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