Belonolaimus longicaudatus

 

Contents

 

Rev 04/09/14

Sting Nematode  Classification Hosts
Morphology and Anatomy Life Cycle
Return to Belonolaimus Menu Economic Importance Damage
Distribution Management
Return to Dolichodoridae Menu Feeding  References
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Classification:     

Rhabditida
       Tylenchina
        Tylenchoidea
         Dolichodoridae
            Belonolaiminae   



  Belonolaimus longicaudatus Rau, 1958 

    Synonyms:
      none.

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Morphology and Anatomy:

Female: Length 2.0-3.0 mm.

Lip region hemispherical, divided bylateral, dorsal, and ventral grooves into 4 main lobes (2 subdorsal and 2 subventral) each bearing 6 or more horizontal striations; two smaller lobes (lateral) with amphid apertures. Lip region generally set off from body by deep constriction, but this may be less marked in some populations. Labial morphology as revealed by SEM is discussed in Smart et al. (1972).

Lateral field marked by a single incisure extending from base of lip region to near tail terminus.

Spear 100-140 m, thin, flexible, with rounded knobs; when retracted, spear causes the esophageal tube to become convoluted.

Excretory pore posterior to median bulb with hemizonid just anterior to it.

Esophageal glands lobe-like extending over anterior end of intestine.

Vulva a transverse slit, vulval lips not protruding, vagina generally with opposing pair of sclerotized pieces in lateral view; two ovaries, amphidelphic, outstretched. Spermathecae present.

Tail 115-189 m long, generally about 5 times anal body width, with rounded terminus. Hyaline portion 5.9 m long. Phasmids inconspicuous. Intestine extending almost to terminus. There are well pronounced serpentine lateral canals present which become visible at about the level of esophageal gland lobe and extend to the tail extremity.

Males: Length, male: 2.0-3.0 mm.

Lip region in outline more flattened at the sides than in female; arrangement of lobes similar.

Testis outstretched. Spicules arcuate with ventral flanges; distal ends pointed with small apical notches. Gubernaculum well developed. Bursa enveloping tail.

Belonolaimus gracilis is distinguished from B. longicaudatus by shorter tail, longer spear, and greater relative width. Different populations of B. longicaudatus show variations in spear knob shape, head shape, size and ratios, shape of spicules, and in vulva sclerotization. All populations have 8 chromosomes.

[Ref: CIH Descriptions of Plant-parasitic Nematodes, Set 3, No. 40 (1974) and H. Ferris.]

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Distribution:

A plant-parasitic nematode of major importance in the southeastern U.S. Reported in Alabama, Arkansas, North and South Carolina, Louisiana, Mississippi, Florida, Kansas, Virginia, New Jersey and Oklahoma. In North-central Florida, 35,000 acres of vegetable land are infested. Nematode not reported outside of U.S.

In 1992, a 3-4 acre infestation was found at a golf course near Palm Springs in Southern California, further sampling has located the nematode on four golf courses in the Rancho Mirage area of Coachella Valley.

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Economic Importance:

A-rated pest in California.  

The infestation in Rancho Mirage, California, triggered eradication or containment legislation to reduce the danger of movement into surrounding agricultural areas. 

The sting nematode is widely distributed in sandy soils throughout the southeastern and central United States. It damages numerous agronomic and some horticultural crops, including citrus.
Root tip feeding kills meristematic cells. Root systems of heavily infested citrus trees are stubby and swollen and there are few fibrous roots.

Sting nematodes became a widespread problem in Florida's citrus industry following a series of freezes between 1983 and1990.  Many orchards had to be re-planted.  Since soils were heavily infested with sting nematode, young trees were severely stunted.


   

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Feeding:

Migratory ectoparasite at root tip and along sides.  

Long stylet penetrates to inner cortex and endodermis; causes root tip damage, resulting in reduced root system with short, stubby branches. 

Gall-like swellings may occur at root tips in corn due to repeated production of new root branches.  

Feeding causes lesions on cotton roots, followed by root girdling.

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Hosts:

Wide host range: cereals, vegetables, celery, sweet corn, strawberries, cotton, forage crops, trees, ornamentals, turf (excellent host), and pasture.  

Tobacco is a non-host.  

North Carolina populations have distinctly different host ranges, although some hosts are suitable for these and other populations. 

Of 60 plant species tested for host status to the B. longicaudatus population in the Coachella Valley, only three were non hosts (Bekal and Becker).

 

For a more extensive list of host species and their susceptibility, copy the name

Belonolaimus longicaudatus

select Nemabase and paste the name in the Genus and species box

 

 

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Life Cycle:

Nematode prefers light, sandy soils (>80% sand with particle size 120 to 320 m [65 mesh], 10% clay); B. longicaudatus does not reproduce well in soils with a composition outside these parameters.

Reproduction is inhibited in soils with large amounts of organic matter.

Soil moisture is also important; optimum reproduction occurs at 7% soil moisture; some reproduction occurs at 3% soil moisture; reproduction and development are inhibited at 30% moisture (Robbins, 1973?). Population densities are directly related to the percent sand in many soils soil (Mashela et al., 1992).

Aeration of water increased survival of nematodes at 30% moisture, suggesting that soil aeration may be very important (Robbins, 1973?).

The effect of temperature has also been studied; at 35 C, Georgia populations of B. longicaudatus survived, but North Carolina populations did not; at 25 to 30 C, both Georgia and North Carolina populations flourished (Robbins, 1973?).

Males and females are present, but life history details are not well understood.

In general, nematodes are confined to the upper 30 cm of soil, but within this zone there is vertical and seasonal fluctuation depending on temperature. High air temperatures force nematodes deeper into the soil, while lower surface temperatures result in a higher concentration of nematodes in the surface layers, with little or no increase below (Boyd & Perry, 1971).

Evidence of genetic diversity is provided by reproductive compatibility among populations:

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Damage:

Devastating on cotton - causes complete crop failures when associated with Fusarium wilt; renders Fusarium wilt-resistant cotton susceptible.

Also causes damage to vegetables, peanuts, and soybeans in the Southeastern coastal plains. Infected plants show an increased tendency to wilt in dry conditions, severe stunting, leaf chlorosis; plant death may occur. 

Belonolaimus longicaudatus damage to peanuts (left), nematode-free control on right.

Belonolaimus longicaudatus damage to bermuda grass.

Most destructive pest of turfgrass in Florida (Busey et al., 1991).

Infested areas vary in size and shape, but the boundary between diseased and healthy plants is usually well-defined.

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Management:

1.  Nematicides

Organophosphate and carbamate nematicides are effective.  ethylene dibromide (EDB) at 10 gpa also was used on peanuts and other crops.  Use of granular nematicides such as Aldicarb and Nemacur is successful in controlling nematode populations.                                              

2.  Crop rotation

Crop rotation is less effective due to wide host-range of the nematode.                                      

3.  Cultural Methods

Tomerlin (1969) found that numbers of B. longicaudatus were reduced in soils amended with alfalfa meal, cottonseed meal, and rice straw. 

Heald & Burton (1968) reported that application of organic nitrogen (activated sewage sludge) reduced populations of B. longicaudatus on bermuda grass and was superior to inorganic nitrogen.

Host Plant Resistance, Non-hosts and Crop Rotation alternatives:

For a list of plant species or cultivars (if any) reported to be immune or to have some level of resistance to this nematode species, copy the name

Belonolaimus longicaudatus

select Nemabase Resistance Search and paste the name in the Genus and species box

 

 

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References:

Grosser, J.W., Chandler, J.L. & Duncan, L.W. 2007. Production of mandarin + pummelo somatic hybrid citrus rootstocks with potential for improved tolerance/resistance to sting nematode. Scientia Horticulturae 113:33-36.

 

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Copyright 1999 by Howard Ferris.
Revised: April 09, 2014.