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Apple Maggot A4159 Apple Maggot Annie Deutsch and Christelle Guédot pple maggot, Rhagoletis pomonella Apple maggot flies are differentiated from (Walsh) (Diptera: Tephritidae), is a many other fruit flies by the pattern of significant insect pest of apples. dark bands on their wings which form an AThe fly received its common name based “F” shape pointing towards the back of the on the immature (maggot) stage of body (figure 2). The wing pattern of the development; it is also commonly known blueberry maggot (R. mendax), however, is as railroad worm. Apple maggot is native almost identical, so it may not be possible to eastern North America, and its natural to visually distinguish between the two FIGURE 1. Apple maggot adult. host plant is hawthorn. When early settlers species. It is unlikely that blueberry introduced the domesticated apple in the maggots would be found on traps in 1600s, apple maggot flies took advantage apple orchards unless blueberry is grown of this new food source and began to lay on the farm. (For more information on eggs in apple fruit. Apple maggot was blueberry maggot, see fact sheet XHT1264 Predominantly a first reported as a pest of apples in the https://fyi.uwex.edu/hort/files/2018/02/ 1860s. Currently there are two races of Blueberry_Maggot.pdf.) pest of apples, apple apple maggot flies, one that preferentially Adult apple maggot females lay single feeds on hawthorn and a second that oval-shaped, white eggs that are preferentially feeds on apples. This approximately 0.04 inches (0.09 cm) long, maggot will also divergence has led to genetic evaluation of directly under the skin of fruit. Females live the species as a possible case of speciation, for around 30 days and can lay up to 300 infest pears, apricots, the separation of two new species from a eggs over the course of a lifespan. After single species. 3 to 10 days, the eggs hatch into cream- Although predominantly a pest of apples, colored, legless maggots (larvae) (figure 3). peaches, cherries, apple maggot will also infest pears, apricots, peaches, cherries, crabapples, crabapples, and wild and wild rose hips. Apple maggot is a significant pest in commercial and backyard orchards in most of the United rose hips. States and eastern Canada. In some western U.S. states, there are fruit-growing regions that do not have apple maggot. In some of these areas, counties where the pest is found have been quarantined to prevent further spread of the fly. Identification and FIGURE 3. Apple maggot larva inside a life cycle plum. Apple maggot flies are 0.16–0.24 inches (0.4–0.6 cm) long. The body is mostly The head of the maggot is identifiable by black, with a white triangular dot on the two dark, parallel, hook-shaped jaws, and end of the thorax and white stripes on the the posterior end has two tan-colored abdomen. The fly’s head is brown with spots (spiracles) for respiration. Larvae prominent, dark-red eyes (figure 1). Male proceed through three developmental flies tend to be smaller than females and stages within fruit before they drop to the have three white stripes on their abdomen ground to pupate approximately 20 to 30 FIGURE 2. Apple maggot distinguishing rather than the four stripes found on days after hatching. Full-grown larvae are features. females. 0.3–0.5 inches (0.7–1.2 cm) long. Pupae are APPLE MAGGOT typically found in the top 2 inches of soil, development throughout the growing Apple maggot damage can be and are about 0.2 inches (0.5 cm) long with season, even in areas with significantly differentiated from other apple fruit a yellow-brown color. Pupae overwinter different temperatures. (For more pests in that the brown tunnels are found and the adult flies emerge in early summer. information about calculating degree days, throughout the fruit flesh. Many other Adults are active for 8 to 10 days after see fact sheet XHT1086, https://fyi.uwex. internal feeders, such as codling moth, will emergence before egg-laying begins edu/hort/files/2014/11/Degree-Day- preferentially feed at the central core of the (pre-ovipositional period). Some apple Calculation.pdf.) apple. maggots will spend an additional year as Environmental factors including rain and pupae, remaining in the soil for the winter, soil moisture, as well as soil type and Control next summer, and following winter before topography, can affect the timing and Monitoring emerging as adult flies. may not be well represented in degree Trapping for apple maggot flies is crucial day estimates for apple maggot. Sufficient for controlling this pest. Traps allow for Degree days rainfall is especially important for adult information regarding when adult flies are Similar to other insects, the developmental emergence, and dry conditions may delay emerging from the soil and for estimating rate of apple maggot is dependent on adult hatch by 2 to 3 weeks. For this reason, the population size; both can vary year temperature: warmer temperatures degree day models should not be used in to year as well as at different sites within increase the speed of development, replacement of traps or other monitoring the same year. Additionally, because whereas cooler temperatures can slow tools, but rather to give additional flies are active before egg-laying begins, or inhibit development. Degree days are information regarding the timing for apple knowing when they first emerge allows for a method of using temperature rather maggot adult emergence and the growth a window of time to apply an insecticide, if than calendar date to approximate the stage of the new generation. time of different growth stages. For apple needed, before damage occurs. maggot, degree days are calculated using Traps for apple maggot include a yellow a base temperature of 50°F beginning Damage sticky card and a baited sticky red sphere accumulation at January 1 or March 1. In orchards, apple maggot damages trap. Yellow sticky cards are often baited There are a few models used for tracking only fruit, and if not controlled can cause with ammonium carbonate or ammonium apple maggot development. The Michigan extensive loss. Damaged fruit can become acetate (feeding attractants). A typical bait State University model predicts that distorted and lumpy from inhibited growth for the red sphere trap is a lure containing adult flies typically start emerging from at the site where the female fly laid an synthetically produced apple volatiles. overwintering pupae in the soil at 900 egg under the fruit skin. After the maggot In general, the yellow card trap is more degree days (approximately early July). hatches, it uses its pointed jaws to pierce effective early in the season as the flies The first eggs are laid around 1,100 degree cells in the fruit pulp and then consumes emerge from pupation, giving a better days, peak adult emergence is at 1,400 the juice. It tunnels its way through the estimate of the start of adult activity. The to 1,700 degree days, peak egg-laying is fruit flesh, leaving behind a brown and red sphere traps are much more effective around 1,750 degree days, and the end of rotting trail (hence the name railroad once egg-laying begins because the female adult emergence is around 2,800 degree worm). This damage is usually not apparent flies are seeking fruit on which to lay their days (Angus H. Howitt, Common Tree Fruit unless the fruit is cut open. If multiple eggs (figure 5). (For more information Pests (NCR063) [Michigan State University larvae are feeding inside a single fruit, the about trapping using attractants, see Extension, 1993] pg. 34). These values can damage can be great enough to cause UW-Extension publication Utilizing Insects’ be used to track apple maggot tissue collapse, which may be seen or felt Sense of Smell for Pest Management (A4135) on the outside of the fruit (figure 4). at https://learningstore.uwex.edu/Assets/ pdfs/A4135.pdf.) Adult flies emerge around early July, and traps should be placed outside in mid-June to ensure that the traps are out before the adults start emerging. Hang traps in tree canopies, especially near wooded or landscaped edges. Check traps at least once a week (ideally every day, especially at the beginning of the season), remove any insects, reapply sticky adhesive as needed, and change the lure according to the manufacturer’s recommendations. FIGURE 4. Apple maggot damage to an apple. 2 UNIVERSITY OF WISCONSIN-EXTENSION Because apple maggot pupates in the Biological control soil, one possible control measure is to Apple maggot is native to the eastern prevent the larvae from reaching the United States, and thus there are native soil. This can be done by placing a tarp, predators present. Parasitoids are the landscape fabric, or thick mulch under most important natural enemies, and a tree to form a barrier. Picking up and researchers have discovered parasitoid destroying all dropped apples may wasps that attack both the egg and larval also reduce populations because many stage of apple maggot. In hawthorn, the damaged apples that contain maggots will fruit is small enough such that the female prematurely fall to the ground. Removing wasp can reach the developing maggot dropped fruit may help reduce populations with her egg-laying appendage, resulting of other insect pests including plum in some level of control. However, apple curculio (see UW-Extension publication fruit are too large, so many parasitoids Plum Curculio (A4160) at https:// cannot attack the maggot. For this learningstore.uwex.edu/Assets/pdfs/ reason, parasitoids have a minimal A4160.pdf). Placing a tarp under the trees effect controlling apple maggot in apple can also assist with collecting the dropped orchards.
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