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1.  Morphological and morphometrical analysis of Heterodera spp. populations in Jordan 
Phenotypic diversity of five Jordanian populations of cyst nematodes, Heterodera spp. collected from five regions from Jordan (Ar-Ramtha, Madaba, Dana, Al-Karak, and Jerash) was investigated. Soil samples were collected from one representative field in each region. Morphological and morphometrical characteristics revealed that Heterodera latipons is dominated in cereal fields at Ar-Ramtha, Madaba, Dana and Al-Karak regions and Heterodera schachtii in Jerash. Cysts populations from all cereal fields had bifenestrate vulval cone and a strong underbridge. Wherever, cysts of the cabbage population had ambifenestrate vulval cone with long vulval slit. The bullae were absent in Ar-Ramtha, Madaba and Dana populations, but present in Al-Karak and Jerash. Based on 12 morphometrical characters, the first three functions in canonical discriminant analysis accounted 99.3% of the total variation. Distance from dorsal gland duct opening to stylet base, underbridge length, a = L/W (body length/midbody width) and length of hyaline tail tip had strong and significant contributions in the first function. While the second function was strongly influenced by length of hyaline tail, fenestral length, fenestral width and tail length. However, the third canonical discriminate function was found to be influenced by stylet length, fenestral length, a = L/W (body length/midbody width) and underbridge width. The graphical representation of the distribution of the samples showed that the first canonical discriminant function clearly separated H. schachtii from Jerash from other populations. Whereas, H. latipons collected from Madaba and Dana were clearly separated in the second function. The results indicated that differences at morphological and morphometrical levels revealed diverse populations of Heterodera spp. in Jordan.
PMCID: PMC4705250  PMID: 26858546
Discriminant analysis; Interspecific variation; Mediterranean cereal cyst nematode; Morphometry; Sugar beet cyst nematode
2.  Phosphonate fertilizers suppressed root knot nematodes Meloidogyne javanica and M. incognita 
Journal of Nematology  2011;43(2):95-100.
The efficacy of the phosphonate fertilizers, Calphos® (a.i. calcium phosphonate), Magphos® (a.i. magnesium phosphonate and potassium phosphonate) and Phosphoros® (a.i. potassium phosphonate) against two species of root knot nematodes (RKN), Meloidogyne javanica and M. incognita is evaluated. Laboratory experiments showed that Calphos®, Magphos® and their main components inhibited egg hatching and caused 100% mortality of the second stage juveniles (J2s) of the two RKN species; the hatching inhibition effects persisted after transferring the egg masses of both species to water. However, Phosphoros® (0.5%) did not suppress egg hatching or the survival of J2s of both RKN species. No hatching occurred when egg masses were treated for one week with the nematicide Vydate L® (2 ml/l), however, J2s hatched when the Vydate L® treated egg masses were moved to water. The glasshouse study indicated that Magphos®, Calphos® and Phosphoros® reduced root galling caused by M. javanica by 98, 66 and 47%, respectively, in comparison to the untreated controls. Magphos® resulted in the lowest number of root galls formed by M. incognita, the reduction was 84%. In contrast, Calphos® and Phosphoros® reduced galling by 47 and 39%, respectively. The Magphos® treatment resulted in the lowest numbers of egg masses and the lowest reproductive factor (RF) of both nematode species. However, plants treated with Phosphoros® resulted in higher foliage weights compared with the application of the other two fertilizers and the untreated plants.
PMCID: PMC3380461  PMID: 22791918
Calphos®; Magphos®; Phosphoros®; RKN; hatching; mortality

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