pest management

Woolly apple aphids are destructive pests, threatening South Africa’s apple-growing industry. Westend61/Getty Images   By Antoinette Paula Malan, Stellenbosch University; Letodi Luki Mathulwe, Stellenbosch University, and Nomakholwa Faith Stokwe, Stellenbosch University   Gardeners the world over dread the appearance of aphids on their plants. There are around 4,000 species of these sap-sucking insects and about 250 are pests that can wreak havoc on crops in a garden or orchard. One […]