Longidorus africanus multiplication on tomato was highest at 29 degrees C. Few nematodes were recovered after 6 weeks at soil temperatures of 35 degrees C or below 23 degrees C. The time to egg hatching was shortest and the percentage of eggs hatching was highest at 29 degrees C. The minimum temperature and the heat sum above this temperature required for egg development were calculated to be 1...

Longidorus breviannulatus n. sp. was associated with stunted corn in Iowa. The nematode has wide bilobed amphidial pouches, a guiding ring 21-26 mum from the anterior end of the body, an odontostyle 81-88 mum long, and a spear extension 28-45 mum long. The most frequent collections and the greatest numbers of the nematode in the field occurred in sandy soils. Nematodes increased in greenhouse c...

The host range of Longidorus africanus was demonstrated to be much wider than previously reported. All commercial crop plants tested, except two of four crucifers, were hosts of L. africanus. The nematode was widespread in fields, and soil type did not appear to be related to its distribution. The minimum time to complete a life cycle was 9 weeks at 28 C in a plant growth chamber. Field observa...

Needle nematodes, Longidorus africanus, were added to carrot and lettuce seedlings in a range of inoculum levels and at various times after seeding. The effects of inoculum density and delayed inoculation on plant growth were analyzed according to Seinhorst's damage function. Growth of both lettuce and carrot was severely affected by L. africanus, but delaying nematode inoculation until 10 days...

Lectotypes are designated for Longidorus sylphus, L. crassus, and L. fragilis from Thorne's original specimens. Amended descriptions, tables of morphological means, ranges and standard deviations, photographs of the anterior, vulval, and tail regions, and diagnoses and relationships are provided for each of the three species to aid identification and to better determine phylogenetic relationshi...

In October 1999, the authors received fixed specimens of a species of Longidorus from Howard Ferris found about the roots of a citrus tree in Oakville, Napa County, CA. After determining it to be new a species, we requested additional specimens. The samples contained roughly equal numbers of males and females. Longidorus ferrisi n. sp. is most similar to L. elongatus, but can be distinguished b...

A new needle nematode, Longidorus carniolensissp. n., recovered from the soil around the roots of grapevine Vitis vinifera L. from Slovenia, is described and illustrated. Longidorus carniolensisis an amphimictic species, characterised by females with a moderately long (L=5.6-8.2 mm) and plump (a=51-72.4, ave. 66.3) body, assuming a spiral to C-shape when heat relaxed. Head region continuous, an...