BIO-ECOLOGICAL FACTS ON LIRIOMYZA TRIFOLI BURGESS (DIPT., AGROMYZIDAE) AND ON ITS PRINCIPAL PARASITE HEMIPTARSENUS SEMIALBICLAVA GIRAULT (HYM., EULOPHIDAE)

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.

IX African Symposium on Horticultural Crops

B. Vercambre, A. Thiery

Liriomyza trifolii, Hemiptarsenus semialbiclava, cyclus, zero development, parasitic capacity, Reunion Island

https://doi.org/10.17660/ActaHortic.1985.153.37