See All Pest, Disease and Weed Identification, See All Beer, Hard Cider, and Distilled Spirits, See All Community Planning and Engagement. Introduced pine sawfly: eastern white pine For added effectiveness, step on those that fall to the ground to kill them. Take a closer look; it may in fact be under attack by the larvae of the European Pine Sawfly. As the larvae mature, the soap method is less effective. When the larvae mature, the soap method is less effective. Early detection is best! The larvae, “the worms that are eating your pine needles”, are about an inch in length at full size with a small black head and a striped back (two light green stripes and one dark green or black strip on each side). 1. However, this is not always the case; Monterey pine sawfly (Itycorsia) larvae are solitary web-spinners that feed on Monterey pinetrees inside … Get notified when we have news, courses, or events of interest to you. Young caterpillar-looking larvae are 1/4 inch in length and olive-green in color with a black head (Figures 1). The larvae, “the worms that are eating your pine needles”, are about an inch in length at full size with a small black head and a striped back (two light green stripes and one dark green or black strip on each side). Yesterday (April 17, 2017) European pine sawfly, Neodiprion sertifer larvae were detected feeding on my “indicator pine” in Manhattan, KS (I was totally excited!). European pine sawfly feeding can result in cosmetic damage to landscape or specimen plantings of pines, but rarely causes serious injury. Create an Account - Increase your productivity, customize your experience, and engage in information you care about. This treatment strategy will protect most host plants growing in landscapes, nurseries, and Christmas tree plantations. Black grouse (Tetrao tetrix) chicks show a strong preference for sawfly larvae. One of nature’s unique creatures is the European pine sawfly. Therefore, another management suggestion may be to remove host pines that are no longer of value in a landscape or nursery. Young larvae eat the surface of the needle causing needles to appear dry and straw-like. During September and October females slit the edges of pine needles with saw-like structures on the tip of their abdomens and lay eggs into these openings. The adult is a fly-like insect that lays eggs in the pine needles in fall. One nonchemical management strategy for this pest would be to remove larvae by pruning an infested branch if this does not affect the tree's overall shape and beauty. The eggs are deposited through an ovipositor (similar in appearance to a stinger) in a line along a needle and appear as yellowish spots. After mating, the female sawfly will than deposit eggs in the current year’s needles and the cycle begins again. Adults emerge from early September until late fall. Additional information can be found at the Penn State Extension website. This aesthetic damage is most apparent on mugo pine in landscapes and nurseries and Scots pine grown in Christmas tree plantations. Adult pine sawfly (Diprion pini) are 10mm long brown winged insects, The larvae reach up to 25mm long and are pale green in colour with a brown head and black markings. Sawfly larvae have the curious habit of raising their heads and tails in a threatening manner when disturbed. Although predators and parasites such as rodents, birds, and insects exist, these natural enemies are usually not effective in managing this pest in the landscape and nursery. Look closer, are there bunches of some sort of worm on the old needles? Females usually select needles grown that year located near the end of a lateral branch. Hatching occurs from late April through early May and larvae begin to feed in groups on the previous year's needles and sometimes the bark of new shoots. The larvae tend to feed from the time they emerge from the egg until about the end of June or early July, after which, most will drop to the ground and spin a cocoon in the duff layer. European pine sawfly larvae have already been reported in several parts of Iowa, and NOW will be your last chance to discover any defoliation in time to treat effectively. Sawflies are mostly herbivores, feeding on plants that have a high concentration of chemical defences. Does your pine appear to be losing its needles? Entering your postal code will help us provide news or event updates for your area. European and redheaded pine sawflies: Scotch, red, Mugo, Jack, and Austrian pines 2. If using a hose, the spraying should be done a couple of times a week during the feeding season. Damage caused by larvae results in the reduced aesthetic value of an infested tree. Although, it’s important to note that portions of a tree that have been stripped of needles will not regenerate new needles. However, this species will also infest eastern white pine, P. strobus; Austrian pine, P. nigra; ponderosa pine, P. ponderosa; shortleaf pine, P. echinata; and pitch pine, P. rigida, if they grow in close proximity to preferred pines. Figure 1. Read and follow directions and safety precautions on labels. It prefers mugo pine, P. mugo; Scots pine, Pinus sylvestris; red pine, P. resinosa; jack pine, P. banksiana; Japanese red pine, P. densiflora; and table mountain pine, P. pungens. By entering your email, you consent to receive communications from Penn State Extension. Dispose of empty containers right away, in a safe manner and place. - Increase your productivity, customize your experience, and engage in information you care about.

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