|Control of Insect Pests on Red Ginger, Hawaii, 1990|
By: T. Y. Hata and A. H. Hara
Beaumont Agri. Res. Center, University of Hawaii-Manoa, 461 W. Lanikaula Street, Hilo, Hawaii 96720, Phone (808) 935-2885
HOST: Red Ginger: Alpina purpurata (Vieill.) K. Schum.
TARGETED PESTS: Banana aphid: Pentalonia nigronervosa Coquerel, Cotton aphid: Aphis gossypii Glover , Citris mealybug:
Planococcus citri (Risso), Obscure mealybug: Pseudococcus affinis(Maskell) , Long-tailed mealybug: Pseudococcus longispinus (Targioni-Tozzetti), An ant: Technomyrmex albipes (Fr. Smith)
Efficacy trials were conducted from 7 Jul to 27 Aug 1990 in field plantings of red ginger. Treatments were arranged in a RCB with 4 replicates per treatment. Insecticide sprays were applied to runoff using a compressed air sprayer with an 8004 Teejet nozzle at 40 psi. Triton B-1956 was added to both foliar applications and the control at a rate of 3.0 fl oz/100 gal. Empire 20MEC was applied as a barrier treatment within the ginger stalks and a 2 ft radius around the planting using the same equipment as foliar applications. Di-syston was applied with a shake type dispenser and immediately worked into the media with a hoe and watered thoroughly. Insecticides were applied at two week intervals for a total of 3 applications except for Di-Syston which was applied once. Water was sprayed in control plots. Fifteen flowers were randomly sampled from each treatment at 3/4 maturity and observed for all insect pests under a dissecting microscope. Three species of mealybugs were pooled for analysis.
Di-Syston 15G and Pageant DF significantly reduced ants, banana aphids and mealybugs. Empire 20MEC totally eliminated ants and mealybugs; however, banana aphids although numerically reduced, were not significantly different from the control. Orthene 75SP significantly reduced banana aphids, but was not effective against ants. Mealybugs were also numerically reduced but not significant. All tested insecticides were not effective against cotton aphids. In addition, phytotoxicity in Di-Syston treated plots was characterized by necrotic spots covering the entire leaf.
|Orthene 75SP||0.25 lb||28.3a||24.9a||35.0a||33.4b||16.6a||28.8a||12.7a||7.6ab|
|Pageant DF||0.5 lb||7.3b||6.7b||5.1a||7.6b||0.5a||1.7a||7.9a||1.4b|
Data transformed to x+1 and subjected to anova (P < 0.05). Means followed by the same letter in a column are not significantly different by Waller-Duncan K-ratio T test. Mealybugs significant at P < 0.1.
*Number of insects observed before and after treatment.
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