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DODDER Cuscuta Gronovii Willd DODDER Cuscuta gronovii Willd. University of Massachusetts, Cranberry Experiment Station Hilary A. Sandler Common or swamp dodder (Cuscuta gronovii Willd.) is enhances the survival capacity of many Cuscuta species the most prevalent and abundant species of dodder in in modern agroecosystems. Dodder is considered to be North America. Its range extends from Maine and Nova a very serious pest in commercial cranberry production, Scotia to Florida and westward through Canada and the capable of reducing yields by at least 50% (Bewick et al., Midwest. It is more abundant in the central and northeast 1988) and sometimes as high as 80 to 100% (Devlin and regions of the United States (Yuncker, 1965). It is an Deubert, 1980). obligate parasite, consisting of yellow twining stems that produce small clusters of white flowers (Parker and Riches, Control of dodder remains challenging for cranberry 1993). Dodder can establish parasitic relationships with growers. Many management options available to growers many agricultural hosts, including cranberry (Vaccinium of annual crops (e.g., altering time of planting, crop rotation, macrocarpon Ait.), blueberry (Vaccinium spp.), alfalfa etc.) are not possible in perennial systems. Pre- (Medicago sativa) and clover (Trifolium spp). It is also emergence herbicides are currently available for control of capable of infecting many other dicotyledonous weeds dodder. Research has shown that cultural practices, such and wild plants (Dawson et al., 1994). as uniform applications of sand (Sandler et al., 1997) may inhibit germination of dodder seedlings. In contrast, Botanists classify this group of parasitic plants either as studies have shown that late water floods are not effective one of over 50 genera in the family, Convolvulaceae (as for control of dodder. Combining chemical and cultural per Yuncker), or place them as a single genus in their strategies may offer the best solution for suppressing own family, Cuscutaceae (Gleason and Cronquist, 1991). dodder in cranberry production (Sandler, 2001). Yuncker described approximately 150 species of Cuscuta, while Gleason and Cronquist described approximately 15 General Description species. The lack of distinctive stem characteristics, Dodder is an annual plant known by several common absence of leaves and roots, and the presence of very names, such as strangle weed, angel’s hair, and golden small flowers, make these plants very difficult to classify. thread (Yuncker, 1965). Seedlings consist only of stem tissue and have no leaves or roots. Stems are slender Dodder is an organism that is prevalent in disturbed strands, usually yellow to orange in color. Even though habitats, which promotes their function as serious weeds dodder relies on its host for life-sustaining nutrients, some (Dawson et al., 1994). For example, C. gronovii is species may contain very small concentrations of described as growing along stream margins, areas of chlorophyll. Dodder is classified as an annual plant continual erosion. Their adaptation to disturbed habitats (completes its life cycle in one season). However, it can Closeup of dodder stem and flowers on loosestrife. Arch of a newly germinated Cranberry bog infested with dodder. seedling. UMASS / AMHERST - CRANBERRY EXPERIMENT STATION overwinter as haustoria (specialized structures that in mowed or pruned vines received from other bogs. Care transport nutrients from the host to the parasite) if the should be taken to fully investigate the presence of any stems of the infected host plant live through the winter. existing dodder infestations prior to the purchase of vine cuttings. Life Cycle and Dispersal Dodder is an obligate parasite; it cannot complete its life Seeds and Seedlings cycle alone. It must form a successful attachment to a Seeds of C. gronovii are very tiny (0.5-1.0 mm diameter), host to live beyond the seedling stage. When the seedling gray to brown in color. They are irregularly round in shape. finds a suitable host, it will twine around the stem. Dodder The seed coat is very hard and has a rough surface. Several will penetrate the susceptible tissues of the host and tiny seeds (ca. 2-4) may be present within a single fruit produce specialized absorption structures called haustoria. capsule. Only a small percentage of the seed population It then loses contact with the ground and lives totally off in the soil may germinate in any single season. It is the host plant. If an acceptable host is not nearby or is thought that seed can remain viable for many years. not colonized, the seedling will die. Research initiated in 1997 at the UMass Cranberry Station indicates that dodder seed collected from Massachusetts Within 2 to 4 days after the seedling has twined around cranberry farms remains viable at least 4 years after the host, haustorial swellings can be seen (MacLoed, planting (Sandler, unpublished data). Thus, once a farm 1961). Haustoria have a high level of growth activity. Even is infested, it can remain infested for many years. if all exterior portions of the dodder plant are completely removed from the host, the embedded haustoria can Most seedlings emerge from a depth of 0.5-1.0 inch of remain alive. New stem tissue can be subsequently soil. Seedlings are rootless and leafless, consisting a generated from the embedded haustoria. This phenomenon thin, yellow, threadlike stem. They emerge as an arch reinforces the need for complete removal of infected hosts (see photo on front page), straighten out and then begin far away from the bog area. to twist in a counterclockwise direction (circumnutation). At this point, they can contact a vertical host and twine Dodder reproduces by seed, but these are not easily around it. Often, newly emerged seedlings are rather dispersed by animals or wind. The fruiting capsule has a difficult to find on the bog floor. It is preferable to look for large amount of air space and can be buoyant. them in thinly vined or bare areas of the bed. Consequently, the major means of dispersal is by water or by human activities. For example, water harvesting Shoots has significantly increased the dispersal and occurrence After attaching to the host, new shoots will develop from of dodder in Massachusetts over the past several decades. the portion of the dodder seedling that is twined around Seed can also be spread through the irrigation system if the host. These stems grow rapidly and re-attach to the the water is contaminated with dodder. Dodder stems host plant. Dodder may attach itself many times to the and seeds, as well as infected hosts, can also be spread same host or branch off to attach to different hosts. If a Narrow-leaved goldenrod infected with dodder. The parasite has produced flowers and seeds on Twining and haustorial the host. connections on carrot. Seeds and capsules. UMASS / AMHERST - CRANBERRY EXPERIMENT STATION seedling does not contact a suitable host, it will continue Raking is another non-chemical option for dodder control. to elongate. The growing tip will remain succulent and For light to moderate infestations, raking is not viable while the basal portion will begin to senescence recommended as fruit yield and quality are diminished and wither. Greenhouse studies (Sandler et al., 1997) and dodder growth is unaffected. For heavy infestations, indicated that unattached seedlings could survive (as raking can prevent the onset of upright dieback caused by determined by visual observation) for a maximum of 50 dodder parasitism. It can also prevent leaf-drop due to days, though most seedlings survived 3 to 9 days after shading of the cranberry plant by the dodder canopy. emergence. However, this research did not verify the ability Raking after seed set offers more control than raking prior of these older seedlings to successfully attach to a host. to seed set. Research has shown that there is no Note also that field conditions tend to be more harsh than additional benefit to raking more than once (Bewick et greenhouse conditions and would presumably shorten the al., 1999). longevity period for newly emerged seedlings. Two pre-emergence herbicides are currently available for Flowers and Fruit control of dodder (Sandler, 2001). Even though these After growing vegetatively, dodder produces clusters of herbicides can be very effective, their efficacy is related to flowers that may be white, pink, or yellowish. The the correct timing of the application and to the presence numerous flowers (see photo on previous page) produce of an effective quantity of herbicide within the germination abundant fruit or capsules that contain the seeds. These layer. Research has documented that the emergence of may fall to the ground and/or be spread during harvest dodder seedlings can extend over a period of 2 to 3 months operations or water movement. (Ellis et al., 2000). This germination period can exceed the performance time period reasonably expected for these Management products. As a result, a portion of the population can Prevention of infestation is the best control option for escape herbicide control and continue to infest the bog dodder. All attempts should be made to avoid introduction during the summer months. of contaminated material or water into a clean bog. If you must use equipment from an infested field, thoroughly clean Postemergence options are very limited. Recent research the equipment prior to use in the clean area. It is important indicated that some commercial cleaning products may to scout various areas of the bog for signs of early offer some post-emergence control (J. Morrison, germination and later in the season, seedling that escaped unpublished data). These studies included an intensive control from herbicide applications. Thinly vined areas or spray program that would likely be cost-prohibitive for many areas where dodder was previously known to occur are growers. Current recommendations do include the use of excellent places to scout for new seedlings.
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