The other rule to follow is that pine borers will be most active in the spring, summer and fall. Then you need to treat all the surrounding trees you want to prevent from getting activity and then decide if you want to attempt to “save” the trees with activity. So lets say you identify activity in the spring. Once beetles are on your land and feeding on your trees, the scenario will change from “preventive” to “saving”. This is especially true if you reside in region with known activity. In general, spraying pine trees you’d like protect once a year would be wise. And though they typically target the most “active” trees, it only a matter of time before the infestation spreads. Remember, they’re looking for new trees on which to land and start laying eggs. More important are the adult beetles which emerge. In general, most healthy trees can withstand a beetle or two but if left alone, this initial activity will multiply to hundreds of beetles as new ones are attracted to exit holes.Īt this point the survival of the tree will be jeopardy. For this reason it is always wise to treat any tree which you suspect may have a small amount of activity. Their emergence will leave a bunch of new holes through which the attractive scent of sap along with their natural pheromones will attract even more beetles. This third stage is called the pupa and when ready, they will hatch and emerge from the tree. Once the larva get their fill, they will undergo a metamorphosis during which time they change to adults. Trees which have been severely damaged will shed their bark and appear naked galleries and tunnels will be visible leaving a sure sign of what caused the damage. This feeding will lead them on a random journey which typically moves around the tree weakening it’s bark to the point of it falling off. Eggs will be laid and when the larva hatch they will immediately begin to feed on the live part of the tree called the phloem and xylem. These tunnels will serve as egg cavities. Once found, beetles will penetrate the bark and then begin excavating tunnels between the bark and the wood of the tree. When a tree is injured and sap runs freely and the odds that beetles find the tree are greatly increased. PINE TREE INJURIES FROM PINE BEETLES ^ PINE TREE KILLEDĪ normal healthy tree will emit or release some sap that can attract beetles.
Once a flow of sap is more than normal, the odds that beetles will find the tree are increased. Pruning at inappropriate times (like the summer), mechanical damage by construction crews cutting protective tree bark, lightning, drought, disease or insect damage like that which can occur from termites can all make a tree more susceptible to pine bark beetles. Though most trees will emit small amounts of sap naturally, trees which sustain injury due to man or nature are more likely to get beetle activity. Pine bark beetles are attracted to pine trees by smelling the trees sap. Softwoods, like pine trees, tend to get damaged quicker and are able to provide harborage to more insects then hard woods over the same period of time. There are other species which will feed on a variety of hardwood trees but these tend to be slower at both reproducing and causing damage. They are quick to reproduce, migrate and eat so once active on any one tree in a stand, it is important to start dealing with them immediately to minimize casualties. Pine bark beetles are the single most destructive pest which attacks pine trees. Though they prefer live trees, they can and will feed on freshly cut stands when available. They are able to fly, reside in trees and can be found at many altitudes around the world. Pine Bark Beetles are small reddish to dark brown beetles about 1/4 to 1/2 of an inch long. PINE BARK BEETLE BIOLOGY ^ PINE BARK BEETLE ADD JOY JUICE FERTILIZER WHEN DRENCHING WITH PROTHOR.HIGH REACHING SPRAYERS FOR INFESTED TREES.POLES, SNAKE TONGS, GRABBERS AND OTHER MISC.INSECTICIDES: SCALP (FOR USE ON PEOPLE).INSECTICIDES: BACTERIA BASED (BACILLUS THURINGIENSIS).BAIT, GRANULE AND LIQUID STATIONS (EMPTY STATIONS).
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