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Blackberries

Blackberry Psyllids Heading for Conifers

11-9-15 blackberry psyllid 101Occasionally you see a wild Blackberry bush with leaves that have stunted growth and are often curled up. This malformation is due to the Blackberry Psyllid (Trioza tripunctata), also known as the Jumping Plant Louse. Closely related to aphids and scale insects, psyllids are plant-feeding bugs which typically have one specific host on which they feed and lay their eggs. Blackberry Psyllids, small, cicada-like insects that hold their wings tent-like over their body, feed only on Blackberry and in so doing, cause this leaf distortion.

Blackberry Psyllids have one generation per year. The adults mate and lay eggs (39-202) on Blackberry bushes in early summer. The nymphs, small and wingless, also feed on the sap of Blackberries. They are often found inside the curled leaves during the summer months where they secrete several types of waxy structures as they feed. In the fall the nymphs mature and overwinter as adults in conifers (pines, spruces and cedars) prior to returning to Blackberry bushes in the spring. If Blackberries are one mile or more from conifers, no psyllid damage will be found; those growing within one-eighth of a mile from conifers are at the greatest risk of psyllid damage.

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Black Bears Seeking Protein

9-2 hornet nest torn by bear 083Although insects and animal matter make up less than 10% of the annual black bear diet, they are a crucial part of it. Black bears get most of their animal protein from ant brood, hornet larvae, tent caterpillars, march fly larvae, grubs (especially June beetle grubs), and snow fleas. Among the most preferred sources are bee and hornet larvae. Berries and other fruit don’t have a great amount of protein, but they do have some (blackberries = 2 grams of protein per cup). If the summer berry crops fail, insect brood is especially important, especially at this time of year, when bears are seeking protein, fats and carbohydrates, putting on as much as 30 pounds per week to sustain themselves through the coming months of hibernation.

When tearing apart a beehive, yellow jacket nest or bald-faced hornet nest (see photo), bears do get stung, particularly on their ears and faces (their fur is fairly impenetrable). Apparently the reward is worth the aggravation. After filling themselves with brood (and in some cases, honey) black bears shake vigorously in order to rid themselves of any insects that are caught in their fur.(Thanks to Alfred Balch for photo op.)

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