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(D3) GRAPEFRUIT: Citrus paradisi Macfaden 'Rio Red' Citrus rust mite (CRM): Phyllocoptruta oleivora (Ashmead) J. Victor French and Santiago Villarreal Texas A&M-Kingsville Citrus Center P.O. Box 1150 Weslaco, TX 78599-1150 Phone: (956) 968-2132 Email: jv-french@tamu.edu EVALUATION OF DANITOL AGAINST RUST MITE, 1998: Danitol 2.4EC was compared with Nexter 75W and Agri-Mek EC + NR 435 Oil for control of CRM. Treatments were assigned to 3 x 2 (= 6 trees) plots in a RCB design and replicated four times on mature grapefruit trees with 18 x 24 ft spacing. Treatment sprays were applied 7 May using a FMC 1229 single volute commercial airblast sprayer with nozzling, pressure and speed calibrated to deliver 200 gpa. For assessing the effects of the treatments, 25 fruit per replicate (100/treatment) were randomly selected and examined for CRM with a 10X handlens before as well as after the treatment. All live CRM were counted in two, 1-sq cm lens fields on the shaded side of each fruit. The two counts per fruit were averaged and recorded as one observation. Upon culmination of the trial, 50 fruit per replicate (200/treatment) were randomly harvested and evaluated for CRM feeding injury (russeting). If one third or more of the fruit surface area was damaged it was downgraded to process or juice fruit. The percent of downgraded fruit for each treatment was determined and expressed as 'percent russet.' All data was subjected to ANOVA and means separated by Waller-Duncan K-Ratio Test with "P" equivalent of 0.001. Danitol 2.4EC while giving good initial control of CRM began to lose residual efficacy at 42 DAT, with significantly higher populations of CRM re-established on trees in the Danitol 2.4EC treatment plots verses the Nexter 75W and Agri-Mek EC treatments by 70 DAT. The shorter residual mite control by Danitol 2.4EC was also reflected in a significantly higher percent of CRM damaged fruit at harvest (13.8%) versus £ 5.6% recorded from trees in the other spray treatment plots. No phytotoxicity was observed on fruit or foliage following any of the spray treatments.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 1999
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