The almond trees in your home garden may be susceptible to sudden attack and severe injury. Certain species of bugs bore into almond trees, leading to the development of subsequent problems. Get to know the most prevalent culprits and what to look for. Keeping your trees healthy and spraying your trees before a problem is severe will keep your home landscape healthy.
Vigorous trees are much less likely to suffer from a borer infestation and very likely to recover compared to weakened trees. For this stone fruit producing tree, grow in locations that provide full sun exposure for optimal growth and fruit production, according to the AgriLife Extension Texas A&M System. Almond trees thrive in moist, well-drained soil but may suffer from diminished health in waterlogged soil. Vigorous trees may be able to resist borers without insecticidal spray.
Two of the most prevalent borer bugs of almond trees are the prune limb borer (Bondia comonana) and the American plum borer (Euzophera semifuneralis), according to the University of California Agriculture and Natural Resources. Overwintering in cocoons inside of the tree, these borers leave their cocoons as adults from April to May, according to the University of California IPM Online.
Almond tree borer bugs are white to pink in their larval stage with a length measuring approximately 1 inch. As adults, borers are winged moths with spotted gray, black and brown bodies. The adult wingspan measures 3/4 inch across, according to the University of California IPM Online. Borers are controllable with chemical sprays.
Almond tree borer pests hatch and bore into almond trees as larvae. As they bore, larvae leave behind a red-orange substance that is a red flag of an impending infestation. Borers primarily attack main tree crotches. While healthy, vigorous trees may suffer branch breakage, they are often resilient enough to heal when treated. For weakened or injured trees, however, borers often bring fungi with them that creates the secondary infection Ceratocystis canker, and the almond tree dies, according to the University of California IPM Online.
For control of borer bugs on almond trees, spray trees with insecticides every six weeks beginning in April. Insecticidal sprays are more effective when the almond tree trunk is painted with latex paint to prevent sunburn, according to the University of California IPM Online. Choose a chemical spray with the active ingredient carbaryl or chlorpyrifos.