It is also a leader in stone fruit production. Leucostoma canker is one of the most important diseases on stone fruit. Shot hole disease is a major concern of the stone fruit industry. Orange trees stretch for hectares as do vineyards and stone fruit orchards. The district also produces cherries and stone fruit. Crops grown in the surrounding area include vegetables, apples, grapes and stone fruit. Kalamunda has extensive areas with orchards, primarily involved in apple and stone fruit production. The site is still one of the most important stone fruit research units in Australia. Fruit grown in the Mundubbera area includes citrus, mangoes, avocadoes and stone fruit. It is also practiced in various horticultural industries such as citrus, stone fruit and tomatoes. Apples, pears and other stone fruit are grown at Kentucky and Arding. Among the hosts are grapes, citrus trees, almonds, stone fruit, and oleanders. This includes characteristic flavors of wet stones and minerals with citrus and stone fruit notes. As Minister he worked to develop agribusiness in the forestry, stone fruit and pomegranate sector. The region is New Zealand's largest apple, pear and stone fruit producer.