Meloidogyne enterolobii

Meloidogyne enterolobii was originally described from a population collected from the pacara earpod tree (Enterolobium contortisiliquum (Vell.) Morong) in China in 1983.[2] In 2001 it was reported for the first time in the continental USA in Florida.[3] M. enterolobii is now considered as one of the most important root-knot nematode species because of its ability of reproducing on root-knot nematode-resistant (Mi-1 gene carrying genotypes) bell pepper and other economically important crops.[4]

Meloidogyne enterolobii
Scientific classification
Kingdom:	Animalia
Phylum:	Nematoda
Class:	Chromadorea
Order:	Tylenchida
Family:	Meloidogynidae
Genus:	Meloidogyne
Species:	M. enterolobii
Binomial name
Meloidogyne enterolobii Yang & Eisenback, 1983
Synonyms [1]
Meloidogyne mayaguensis Rammah & Hirschmann, 1988

Morphology

M. enterolobii, a sedentary endoparasite, has very similar morphology as other species of Meloidogyne. The perineal patterns, male stylet length values (smaller for M. enterolobii than M. incognita) and J2 tail length values (greater for M. enterolobii than M. incognita) of M. enterolobii isolates from Florida are useful morphological characters for the separation of M. enterolobii from M. incognita. Other methods such as enzyme analyses and DNA analysis also have been performed to identify M. enterolobii from other Meloidogyne species.[5][6][7]

Reproduction

M. enterolobii is an apomictic species of root-knot nematodes.[8]

Distribution

M. enterolobii is a tropical or subtropical species reported in Brazil, Venezuela, China, Cuba, France, Guatemala, Puerto Rico, Martinique, Malawi, Senegal, South Africa, Switzerland, Trinidad and Tobago, United States, and West Africa (Ivory Coast and Burkina Faso).[5]

Host

It has a variety of hosts, such as eggplant (Solanum melongena), bell pepper (Capsicum annuum), soybean (Glycine max), sweet potato (Ipomoea batatas), tobacco (Nicotiana tabacum), tomato (Lycopersicon esculentum), watermelon (Citrullus lanatus).[9]

Management

The most efficient control method is preplant soil fumigation with methyl bromide (Mbr). That can reduce the M. incognita reproduction by almost 100%.[10] However, the soil fumigant methyl bromide has been phased out in 2005 because of its negative effects on the ozone layer. A 1995 economic study declared that banning methyl bromide without an alternative method of controlling nematodes would cost the nation's bell pepper industry $127 million in losses.[11]

Some Mbr alternatives have been tested, such as Metham sodium plus chloropicrin (Mna+Pic) and 1,3-Dichloropropene (1,3-D) plus Pic. Mna+Pic provided equal or better Meloidogyne control than methyl bromide plus pic, for sting nematode, they are equal to MBR plus pic.[12] Other alternative such as Multiguard, which is a formulation of furfural, a compound derived from sugarcane waste, which has been reported to have both nematicidal and antifungal properties.[13]

Nematode-resistant bell pepper cultivar is another method to control nematode population. Two bell pepper cultivars, Carolina Wonder and Charleston Belle, have been widely planted in the United States.[14]. However, while these varieties offer resistance to M. incognita, they are susceptible to M. enterolobii.

Crop rotation can be used to control M. enterolobii. The root-knot resistant bell peppers are not suggested to be planted in the field all over the seasons because that will select more M. enterolobii, which will survive and become a big population. Meanwhile, less severe yield loss of susceptible bell peppers has been observed when growing them after resistant bell peppers.[15]

References

1. David J. Hunt & Zafar A. Handoo (2009). "Taxonomy, identification, and principal species". In Roland N. Perry, Maurice Moens & James L. Starr (ed.). Root-knot Nematodes. CAB International. pp. 55–97. ISBN 978-1-84593-492-7.
2. Baojun Yang & J. D. Eisenback (1983). "Meloidogyne enterolobii n. sp. (Meloidogynidae), a root-knot nematode parasitizing pacara ear pod tree in China". Journal of Nematology. 15 (3): 381–391. PMC 2618283. PMID 19295822.
3. Janete Brito; Jason Stanley; Ramazan Cetintas; Tom Powers; Renata Inserra; Gene McAvoy; Maria Mendes; Billy Crow; Don Dickson (October 31 – November 3, 2004). Meloidogyne mayaguensis a new plant nematode species, poses threat for vegetable production in Florida (PDF). 2004 Annual International Research Conference on Methyl Bromide Alternatives and Emissions Reductions. Orlando, Florida.
4. Brito, Janete, Jason Stanley, Ramazan Cetintas, M. Di Vito, Judy Thies & Don Dickson (October 31 – November 3, 2004). Meloidogyne mayaguensis reproduction on resistant tomato and pepper (PDF). 2004 Annual International Research Conference on Methyl Bromide Alternatives and Emissions Reductions. Orlando, Florida.CS1 maint: multiple names: authors list (link)
5. Esendugue Greg Fonsah (2005). "Commercial Pepper Production, Marketing and Management" (PDF). University of Georgia. Archived from the original (PDF) on 2012-03-26.
6. "Vegetables Annual Summary". Economics, Statistics, and Market Information System. United States Department of Agriculture.
7. J. N. Sasser & C. C. Carter (1985). An Advanced Treatise on Meloidogyne. Volume I: Biology and Control. North Carolina State University. ISBN 978-0-931901-01-0.
8. Lunt DH. Genetic tests of ancient asexuality in root knot nematodes reveal recent hybrid origins. BMC Evol Biol. 2008;8:194–216. doi: 10.1186/1471-2148-8-194.
9. J. Brito; T. O. Powers; P. G. Mullin; R. N. Inserra; D. W. Dickson (2004). "Morphological and molecular characterization of Meloidogyne mayaguensis isolates from Florida" (PDF). Journal of Nematology. 36 (3): 232–240. PMC 2620774. PMID 19262811. Archived from the original (PDF) on 2012-03-26.
10. Robert Linderman; Wayne Dixon; Stephen Fraedrich; Richard S. Smith, Jr. (1994). Alternatives to methyl bromide: Assessments of research needs and priorities. Tree Planters' Notes. Proceedings of the USDA Workshop on Alternatives to Methyl Bromide. 45 (2). Arlington, VA. pp. 43–47. Archived from the original (PDF) on 2011-09-29.
11. The Tomato Magazine. February 2003. Missing or empty |title= (help)
12. James P. Gilreath; Bielinski M. Santos; Timothy N. Motis; Joseph W. Noling; John M. Mirusso (2005). "Methyl bromide alternatives for nematode and Cyperus control in bell pepper (Capsicum annuum)" (PDF). Crop Protection. 24 (10): 903–908. doi:10.1016/j.cropro.2005.01.016. Archived from the original (PDF) on 2011-09-30. Retrieved 2011-06-28.
13. N. K. Burelle (2006). "Effects of multiguard protect on root-knot nematode populations and disease of tomato and pepper". Journal of Nematology. 38 (4).
14. Richard L. Fery, Philip D. Dukes, Sr. & Judy A. Thies (1998). "'Caroline Wonder' and 'Charleston Belle': Southern root-knot nematode resistant bell peppers" (PDF). HortScience. 33 (5): 900–902. doi:10.21273/HORTSCI.33.5.900.CS1 maint: multiple names: authors list (link)
15. Judy A. Thies; Richard F. Davis; John D. Mueller; Richard L. Fery; David B. Langston; Gilbert Miller (2004). "Double-cropping cucumbers and squash after resistant bell pepper for root-knot nematode management". Plant Disease. 88 (6): 589–593. doi:10.1094/PDIS.2004.88.6.589.

External links

• Meloidogyne mayaguenesis pest information