Table 1.

Parasitism by S. villeneuveana of C. acuta on Yorke Peninsula, South Australia, in January and April of 2019 and 2020.

	2019		2020		Total
	Jan	Apr	Jan	Apr
No. sites with C. acuta	14	19	19	18	19
No. sites with fly detected	8	13	13	13	13
No. suitable snails >5 $\mathrm{mm}$	37,347	9512	26,888	11,926	85,673
No. live snails	36,261	8352	23,872	8252	76,737
No. dead snails (unknown)	597	349	2499	3548	6993
No. shells with fly larva	1	15	8	1	25
No. shells with fly pupa	54	55	31	25	165
No. shells with dead fly	23	56	35	0	114
No. shells with open fly pupa	411	685	443	100	1639
No. flies emerged during rearing	104	189	69	23	385
Parasitism rate (all sites)	1.31%	8.53%	1.92%	1.06%	2.27%
Parasitism rate (fly-positive sites)	1.78%	10.72%	2.30%	1.18%	2.85%