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Using Entomopathogenic Nematodes for Turfgrass Pest Management

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Using Entomopathogenic Nematodes for Turfgrass Pest Management A PRACTICAL RESEARCH DIGEST FOR TURF MANAGERS TURFG Volume 10, Issue 5 • May 2001 S TRENDS I T URFGRASS PEST MANAGEMENT IN THIS ISSUE Using entomopathogenic nematodes for turfgrass Using Entomopathogenic pest management 1 Nematodes for Tiirfgrass Life cycle Pest Management Species, strains, behavior Pests controlled By Parwinder Grewal Plant-parasitic nematodes ntomopathogenic nematodes (Steinernema and Heterorhabditis) are microscopic Where to buy roundworms that parasitize and kill insects in the soil. These nematodes have demon- Estrated potential for biological control of insect pests. Quality The entomopathogenic nematodes occur naturally in almost all soils and reproduce in dead hosts (see Fig. 1). The nematodes cause widespread mortality of insects in the soil and How and when to apply are often seen as crashes in insect populations or conspicuous epizootics. More than 30 of Compatibility these nematode species have been discovered world- wide. Due to the ease in nematode mass production, Conservation Tests on home lawn several nematode-based products have been developed for use as biological insecticides. Entomopathogenic Two more unconventional turf have shown that grass families to know nematodes are well suited for pest control in turfgrass and love 8 S. carpocapsae is the because they attack a broad range of pests and can be most effective nema- easily mass-produced and applied using conventional Three species of alkali spray equipment. grass tode species for the control of army- Life cycle Test trials Under suitable environmental conditions, the infective From the editor. 15 worms. juvenile nematodes seek insect larvae and pupae in soil. They penetrate host insects through natural body open- Grass: stupidly simple? ings (mouth, anus, and spiracles) and release a bacterium that kills the insects within a day or two. Insects killed by the nematodes are flaccid, do not give off foul smell, and have con- spicuous colors. For example, insects killed by Steinernema carpocapsae are yellow and those killed by Heterorhabditis bacteriophora are reddish brown. After the death of the host, nematodes feed on the bacteria, and insect body contents, and reproduce. Within two to three weeks, hundreds of infective juveniles are released into the environment to seek out new insect hosts and continue their life cycle. For commercial uses, they are mass-produced either in live insects or in fermenters. Species, strains and searching behavior Nematode species and strains differ in their activity against different insect pests. These dif- ferences are due to the different search behaviors of nematodes, and also the type and num- ber of bacteria carried by the infective juveniles. Steinernema carpocapsae will kill more mobile insects that live in the upper soil or thatch layer, such as billbugs, sod webworms, TURFGRASS TRENDS BTURFGRASS PEST MANAGEMENT Executive Editor Sue Gibson 440/891-2729; 440/891-2675 (fax) cutworms, and armyworms. This nematode ing pest of warm-season grasses. Both S. car- [email protected] species uses an ambush approach to find pocapsae and H. bacteriophora are effective Managing Editor insect hosts. against sod webworms in turfgrass. Curt Harter The infective juvenile nematodes stand 440/238-4556; 440/238-4116 [email protected] on their tails and wait for long periods for WEEVILS On Line Editor insect to come into range. Steinernema The annual bluegrass weevil or Hyperodes Lynn Brakeman glaseri and H. bacteriophora on the other weevil is an important pest of Poa annua Senior Science Editor hand use a more active search strategy and annual bluegrass on golfcourses in the Dr. Karl Danneberger called cruising, to find insect hosts. These northeastern United States. S. carpocapsae, Croup Editor nematodes are therefore, more effective H. bacteriophora, and H. megidis have Vern Henry against less mobile hosts such as white shown good results for the control of wee- Production Manager grubs. This distinction should be used as an vil larvae in golfcourse turf. Rene' Fall 218/723-9352; 218/723-9223 (fax) overall guide for matching the right nema- Two species of billbugs are most impor- [email protected] tode species with the target pest. Turfgrass Senior Graphic designer pests that can be successfully controlled by Jeff Landis the nematodes are listed in Table 1. 440/891-2702; 440/891-2675 (fax) Soil temperatures between [email protected] 50° F to 85° F are favorable Circulation Manager Pests controlled Cheryl Beeman ARMYWORMS for application of most nema- 218/723-9271 The common armyworm, fall armyworm, Croup Publisher and yellowstriped armyworm most com- tode species. If soil tempera- John D. Payne monly damage home lawns, and only occa- 440/891-2786; 440/891-2675 (fax) ture is above 85° F, pre- [email protected] sionally are pests on golfcourse turf. Army- Corporate & Editorial Office worms are also very susceptible to application irrigation is 7500 Old Oak Blvd. nematodes, as all larval stages and the pupae usually recommended to Cleveland, OH 44130-3369 may be infected. Tests on home lawn turf New Subscriptions have shown that S. carpocapsae is the most reduce soil temperature prior 888/527-7008 effective nematode species for the control to nematode application. Abstracts: 800/466-8443 of armyworms. Reprint: 440/891-2744 Permission: 440/891-2742 Single copy or back issues: CUTWORMS tant in turfgrass. The bluegrass billbug dam- Subscription/Customer Service The black cutworm is found throughout ages most cool-season grasses, but mainly 888/527-7008; (fax) 218/723-9437 Web site address: North America and is a perennial problem Kentucky bluegrass and perennial ryegrass. tiww.landscapemanagement.net on bentgrass turf of golf course greens, tees, The hunting billbug causes damage to and fairways, but rarely damages lawns. The warm-season turfgrasses including bronzed, variegated, and glassy cutworms bermudagrass and Zoysiagrass. Nematodes W are pests of home lawn turf. Cutworms are infect both adult and larval billbugs, but ADVANSTAR semi-subterranean pests and usually dig a treatments against larvae are generally more C O M M U N I C A T I O N S burrow into the ground or thatch and effective. Trials often show nematodes to be Chairman and emerge at night to clip off grass blades and more effective than standard insecticides Chief Executive Officer shoots. S. carpocapsae can be used effec- when larval stages are treated. In fact nema- Robert L. Krakoff tively to manage all cutworm species. Black todes are the most effective control method Vice Chairman James M. Alic cutworm larvae can be controlled on golf for the hunting billbug on golfcourses in VP-Finance, CFO & Secretary course greens by applying nematodes at a Japan. Both S. carpocapsae and H. bacterio- David W. Montgomery rate of 1.0 billion per acre. phora are equally effective. Executive Vice Presidents William J. Cooke SOD WEBWORMS FLEAS Alexander S. DeBarr Morris R. Levitt The bluegrass, larger, western, striped, ele- Larvae of the cat flea are highly susceptible Daniel M. Phillips gant, and vagabond sod webworms, along to nematodes The cat flea is a cosmopolitan Vice President & with the closely related cranberry girdler parasite on dogs and cats, and has. also been General Counsel sometimes damage cool season grasses. The reported feeding on humans. Flea adults Eric I. Lisman tropical sod webworm is the most damag- spend most of their time feeding on mam- Treasurer and Controller Adele D. Hartwick Qj Turf Grass Trends MAY 200 1 mal hosts where mating and egg laying also occur. The eggs eventually drop off the ani- mal and the emerging larvae feed on organ- ic debris in pet beddings on lawns, carpet- ing, or upholstered furniture. Nematodes have been extremely effec- tive at controlling flea larvae and pupae in home lawns. In tests performed in North Carolina, S. carpocapsae applied at 1 billion per acre caused more than 90% mortality of flea larvae within 24 h. Steinernema car- pocapsae also caused 91 to 97% mortality of flea pupae in cocoons in a test in Louisiana. Nematodes are most effective against flea larvae in turf and soil when the outdoor Fig. 1. Entomopathogenic nematodes reproducing inside a temperatures are above 14° C and the soil recently killed white grub. is moist. S. carpocapsae-based products Interrupt and bio Flea Halt became extremely popular in 1994 and 1995. during the summer of 1985. Based on the evaluation of field-collected mole crickets CRANE FLIES OR LEATHER JACKETS over a five-year period, the nematodes were European crane fly is considered a pest of found to be established at all the sites, with turfgrass in British Columbia, Nova Scotia, Oregon, and Washington. Substantial research conducted in Europe shows that Nematodes + bacteria the crane fly larva is highly susceptible to U's search for I J's enter host overcome host heterorhabditid nematodes. new hosts immune response MOLE CRICKETS The tawny mole cricket and the southern mole cricket are the two most destructive crickets and are distributed throughout the Nematodes develop to adults Us leave cadaver coastal plain region of the southeast United Reproduction States. Mole crickets are considered the most serious pests of turf and pasture grass- Multiple es. Adult and nymphal mole crickets cause generations in \ large hosts damage by feeding on grass roots and Decline in food supply shoots, and by tunneling through the signals the production of new infective juveniles ground. A single mole cricket can create 10 to 20 feet of tunnel in just one night, drying Fig. 2. Generalized life cycle of Steinernema and Heterorhabditis out the soil and causing serious damage to nematodes. plant roots. Annual costs of controlling mole crickets are estimated to exceed 50 million the mean number of adults infected being in Florida alone. 11 % for the entire period. Nematodes have been successful in A British company has recently acquired reducing damage to turfgrass by mole crick- a license for this nematode from the Uni- ets.
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