Incidence of a New Pest, the Cotton Mealybug Phenacoccus solenopsis Tinsley, on Sesame in North Ethiopia

Table 4

Means of cotton mealybug in oxen and tractor plowed sesame farms with 95% confidence limits.

Tillage device		Incidence (%)	s.e.	CV	95% confidence limits
					Lower	Upper
Oxen	48	82.7	3.01	3.64	76.8	88.7
Tractor	132	55.7	3.98	7.14	47.9	63.6
Total	180