Bentley, Walter J.

Kosareff, Jason

Luvisi, Donald

Undetermined

ScholarsArchive@OSU

I. Grapes-(Pome Fruits)a. Chemical Control1. Grape Mealybug (Pseudococcus maritimus) on Table Grapes (Vitis Vinifera)Walter Bentley, Jason KosarefF, Donald LuvisiUniversity of California Cooperative Extension1031 S. Mt. Vernon Avenue, Bakersfield, CA 93307A series of insecticide trials were established in 1993 to evaluate both insecticide, timing, and gallonagein managing grape mealybug in table grapes. Two of these trials are reported herein.A series of treatments were applied to Superior Seedlesstable grapes (plots were 2 rows wide and 50 vineslong) and Thompson Seedless table grapes (1 row and 100 vines long). Treatments were replicated 4times.Infestation was determined at harvest by sampling 25 bunches touching the vine trunk. Superior Seedlesswas harvested on July 12, 1993, and the Flame Seedless harvested on August 3, 1993.The results of the Superior Seedless trial showed each of the treatments significantly reduced infestationover the untreated. The dormont oil application was not different from either the untreated or theorganophosphate treatments.The results of the Thompson Seedless trial showed each of the treatments with Lorsban was significantlybetter than Guthion WP treatments, the Volck oil treatments, and the untreated. The untreated was nodifferent from Guthion treatments or the oil treatment.THE EFFECTS OF VARIOUS INSECTICIDE TREATMENTSON INFESTATION OF GRAPE MEALYBUGSuperior Seedless July 123,1993Walt BenUey, Jason Kosareff, Don LuvisiMaterial Rate/Acre Gallonage Date Average/25!Lorsban«4E 2pts 300 3/3/93 2.00aLorsban®4E 4pts 300 3/3/93 230aLorsban»4E 2 pts 200 5/7/93 130aUntreated 7.00 bLorsban*4E andSupreme Oil2 pts2 gal300 3/3/93 2.75aLorsban®4E andSupreme Oil4 pts2 gal300 3/3/93 130aGuthion* 2L 6 pts 300 3/3/93 2.00aGuthion*2L andSupreme Oil6 pts2 gal300 3/3/93 1.25aVolck Supreme Oil 2 gal 300 3/3/93 4J5abLorsban*4E 4 pts 150 3/3/93 2.75aLorsban»4E 8 pts 150 3/3/93 2.75aLorsban«4E andSupreme Oil4 pts2 gal150 3/3/93 2.25a25 Bunches selected from 20 to 25 vines. Bunches touching bark ornear cordon.{Treatments followed by the same letter not significantly differentP<0.05 using Fisher's protected LSD.THE EFFECTS OF DELAYED DORMANTINSECTICIDE TREATMENTSONINFESTATION OF GRAPE MEALYBUGTHOMPSON SEEDLESS 8/3/93W. Bentley, J. Kosareff, D. LuvisiMATERIAL RATE/ACRE300 GALAVERAGE/25!Lorsban84E 4 pts 13abLorsban»4E 8 PTS 1.0ALorsban*4eSupreme Oil4 pts2 gal4.0 bLorsban*4ESupreme Oil8 pts2 gal2.0abGuthion 50WP 3 lbs 22.3 cdGuthion 50WPSupreme Oil3 lbs2 gal21.0 cSupreme Oil 2 gal 23.8 cdUntreated 25.0 d25 bunches selected from 20 to 25 vines.Bunches touching bark near cordon treatmentsreplicated 3 times.{Treatments followed by the same letter notsignificantly different (P<0.05) using Fisher'sprotected LSD.57

Grape mealybug (Pseudococcus maritimus) on table grapes (Vitis vinifera)

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Grape mealybug (Pseudococcus maritimus) on table grapes (Vitis vinifera)

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