TIMING OF NEMATICIDE APPLICATIONS ON TURFGRASS TO REDUCE DAMAGE CAUSED BY BELONLAIMUS LONGICAUDATUS

摘要

Sting nematode (Belonolaimus longicaudatus) is an important pest of bermudagrass (Cynodon dactylon),and other turfgrasses grown in the southeastern United States.In 2006,two field experiments were conducted to compare the effects of early spring,late spring,mid-summer,or early fall applications of the nematicide 1,3-dichloropropene (1,3-D) (Curfew? Dow AgroSciences,Indianapolis,IN) on sting nematode populations and bermudagrass roots,and to determine the optimum time to apply nematicide treatments to golf course turf in Florida.Treatments were untreated control,and 1,3-D applied at 46.76 liters/ha in March,May,July,or September.Belonolaimus longicaudatus population densities and root lengths were evaluated following treatments.At the Sandpiper Golf Club (SP) course,1,3-D application did not reduce (P > 0.1) population densities of B.longicaudatus compared to the untreated control at any sampling date.However,root length increased compared to the untreated plots after 2006 March and 2006 May treatments of 1,3-D.Root lengths were greater (P ≤ 0.10) at 4,12 and 16 weeks following the 2006 March 1,3-D treatment compared with the untreated plots.Root lengths were greater (P ≤ 0.1) at 4,8 and 12 weeks after the 2006 May treatment of 1,3-D compared to the untreated.At the CR course,1,3-D treatments had no effect (P > 0.10) on sting nematode populations or root lengths.Findings based on this research suggest that 2006 March or May applications of 1,3-D to bermudagrass in Florida are more effective than 2006 July or September 1,3-D applications for the improvement of root growth in fairways infested with B.longicaudatus