Effect of "Cotton Complex" Nematodes on Seed Yields of Soybean
Schlagworte:
Gossypium hirsutum, Pest Management, Host-Plant Resistance, Ectoparasitic Nematodes, Crop Loss AssessmentAbstract
Field experiments were conducted for 3 years to assess vield loss to a mixture of lance (Hoplolaimus galeatus), lesion (Pratylenchus spp.), stubby-root (Paratrichodorus christiei), and spiral nematodes (Helicotylenchus dihystera) in 7 soybean cultivars. Yield loss was assessed by comparing control plots with plots that received a planting-time application of 18.7 L EDB/ha. In the first year nematodes reduced yield by 24% with no effect on above-ground appearance of plants. Fumigation also influenced nematode numbers the first year, but cultivars did not. Yield loss from nematodes was slightly less during the next 2 years (14% and 13%). Cultivars affected nematode numbers only in one of 3 years. We concluded that this particular nematode complex was capable of causing significant yield loss, and that genetic variability among the cultivars tested for reaction to individual nematode species was minimal.Downloads
Veröffentlicht
1987-06-01
Ausgabe
Rubrik
Articles