This page covers various aspects of crop management for the production of nuts.Each of the nut industry peak bodies websites contain information on crop management considerations for respective nut types.
Nut crops have differing pollination requirements. Hazel nuts, walnuts and chestnuts are all wind-pollinated. Transfer of pollen from an anther (pollen sac) of one plant to a stigma (tip of the female part of a flower) of another plant by wind. The pollen is typically produced in large quantities and may be winged; the flowers typically do not secrete nectar - (Department of Agriculture and Food - WA)
Where the opportunity exists, biological control of pest species can offer significant sustainable, environmental and commercial advantages to alternative methods of pest and vegetative management.
Damage control techniques to assist in protecting nut crops include scaring, shooting, trapping, exclusion, minimising residual grain and even providing decoy foods.
As a number of species of birds causing crop damage are also protected under legislation, you should contact a relevant state government representative if your preferred control mechanism involves trapping or destruction of wildlife, and you're unsure of legal requirements. Generally shooting is heavily restricted, environmentally unacceptable, labour intensive and expensive.The following "Notes" and references may assist.
Soil, nutrition and orchard floor management (NSW Primary Industries - Agriculture)