Mealybugs and scales
order Hemiptera (the true bugs ). Coccoidea are at first sight barely recognizable as insects. The females are wingless and immobile, and covered with a [...] of this type of pest. Among ornamental crops, ferns are particularly sensitive to soft scales, as are oleanders and orchids. Armoured scales, unlike mealybugs [...] Biological control of mealybugs and scales Mealybugs and scale insects are persistent pests that feed on plant sap, weakening crops and producing honeydew