There are few insects or fungous diseases which need cause the American kaki-grower serious concern. The Mediterranean fruit-fly (Ceratitis capitata Wied.) attacks the fruit in Australia, but this insect has not yet made its appearance in the United States. A few scale insects are occasionally found in the kaki orchards of California and Florida, but the attacks of none have proved serious. Hume writes as follows with reference to Florida:
"The worst enemy of persimmon trees, and the only one worthy of note, is the flat-headed borer (Dicera obscura), a native insect. The adult is a hard, metallic beetle, about five-eighths inch in length. It lays its eggs in rough-barked places in the crotches of the tree, or in wounds made in pruning or resulting from injuries of any kind. The young borers hatched from these eggs bore through the bark, work between the bark and wood, later boring into the wood. The larvae when well grown are about one inch long, white, with broad, flat heads and round bodies. That they are at work in a tree may be known by the discolored bark and by gum oozing from the trunk or branches. Cut away the bark with a sharp knife or chisel and destroy them. Paint the wounds thus made with good, thick, white-lead paint. Carefully paint all wounds when made, and scrape the rough-barked places on young trees. By careful attention to wounds on the trees, they may be prevented from entering, and the trees will live to a good old age."