Dendroctonus frontalis Zimmermann Insecta: This aggressive tree killer is a native insect that lives predominantly in the inner bark of pine trees. Trees attacked by SPB often exhibit hundreds of resin masses i.
Biology Pine beetles are also known as bark beetles. The scientific name is: The pine beetle will complete its life span under the bark of a pine tree. There is an exception to the preceding rule, and that is when the adult beetle emerges, only to attack new trees.
The beetle is not a welcome insect. It spends its time infesting and killing such trees as the ponderosa, sugar, lodgepole, and white pine.
The infestation of this insect generally occurs most frequently within lodgepole pine stands containing large sized trees or within the dense stands of ponderosa pine.
Infestation by the beetle can cause large-scale tree destruction: A beetle infestation is not good news since during these outbreaks; the tree destruction can greatly alter the eco-system of the forest as a whole. This means, some forests are virtually stripped; resulting in areas of mere shrubs and grassland!
Further, such an outbreak can completely change the habitation of wildlife in the area; since many species, beforehand, had counted on the forest as a form of protection or cover.
Tree mortality can cause the water yield to naturally diminish, too. The mountain beetle develops through four successive stages including: All of these stages are spent under the bark of the tree it has infested.
There is one exception; however—that being, as alluded above, the few days when the adult beetles emerge to fly to other trees. During the first stage, female beetles create straight egg galleries: The egg galleries range in size from four to forty-eight inches long; and on average they are ten inches long.
The female beetle will then lay her eggs along the galleries she has created underneath the bark of the pine tree. She lays her eggs during the summer and autumn months.
The larvae are white with brownish heads; and have no legs. The larvae stage lasts for around ten months, generally from August to the next June. The larvae feeds on the phloem; creating additional galleries, in so doing, that extend: The larvae, when mature, excavates oval shaped cells in order for the transformation of the third stage of pupae to take effect.
Lastly, the beetle reaches the adult stage. The adult beetle feeds inside the bark of the tree before emerging. Emergence occurs after a number of feeding chambers coalesce. One or two of the adult beetles will make a hole within the bark in which to exit.
After so doing, a number of the adults will fly out of this exit hole to attack new trees. The harmful beetles contain spores of fungi on their bodies and in a special arrangement on their heads.
The two factors contribute to the eventual destruction of the tree. Mountain pine beetle dynamics in lodgepole pine forest.The mountain pine beetle (Dendroctonus ponderosae) is a species of bark beetle native to the forests of western North America from Mexico to central British Columbia.
It has a hard black exoskeleton, and measures approximately 5 mm, about the size of a grain of rice. The western pine beetle, Figure 6 - Life stages of the western pine beetle: (A) adult and eggs five times the natural size and (B) After completing four larval stages, they transform into pupae and then into adults.
As these brood adults feed on the middle and outer bark, fungal spores collect in their mycangia. Once the adult insects. Southern pine beetles attack mainly densely stocked, slow growing pine stands with a high percentage of over-mature pine saw timber.
Some pine tree species are more susceptible than others. Trees damaged by lightning and other natural events or by nearby construction are more likely to be infested. Southern Pine Beetle Identification, Biology and Management Donald C.
Booth, Ph.D. Introduction: The southern pine beetle, Dendroctonus frontalis, is a small insect native to North America. The scientific name Dendroctonus means "tree killer"- a well deserved name since this species is the most destructive forest insect pest in the United States.
The southern pine beetle has four life stages: egg, larva, pupa, and adult. The adult is dark red brown to black in color and mm in length (Fig. 2). The rear end is rounded and the head is visible from above.
The egg is pearly white (Fig. 3). The crescent-shaped larva is. A Field Guide for Ground Checking Southern Pine Beetle Spots. Southern Pine Beetle Handbook.
United States Department of Agriculture Combined Forest Pest Research and Development Program - Agriculture Handbook No. - Issued November Stages of Beetle Attack During The Summer.