The Efficacy of Micro-Injected Imidacloprid and Oxydemeton-Methyl on Red Gum Eucalyptus Trees (Eucalyptus Camaldulensis) Infested With Red Gum Lerp Psyllid (Glycaspis Brimblecombei)

Lester C. Young

doi:10.48044/jauf.2002.021

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Table 1.

Pre- and post-treatment monthly means^z (4-week intervals) of numbers of live red gum lerp psyllid nymphs per leaf in trees treated with insecticides^y.

Treatment	Pretreatment	Post-treatment
Treatment	7/1/99	7/16 – 8/6	8/13 – 9/3	9/10 – 10/2
Imidacloprid^x	5.42 a	2.28 a	0.49 a	0.43 a
Combination^w	5.36 a	1.77 a	1.16 a	1.55 a
Oxydemeton-methyl^v	5.26 a	0.87 a	2.51 a	4.77 b
Untreated	5.62 a	4.70 b	8.32 b	4.22 b

↵z Means followed by the same letter are not significantly different at the 5% level (Fisher’s PLSD).
↵y Treatments applied July 8, 1999.
↵x Imicide® 3 mL 10% active ingredient per 5-cm trunk diameter.
↵w Imicide® 2 mL 10% active ingredient and Injecticide® 3mL 50% active ingredient per 5-cm trunk diameter.
↵v Injecticide® applied 3 mL of 50% active ingredient per 5-cm of trunk diameter.

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Table 2.

Post-treatment monthly means^z of numbers of RGLP nymphs/leaf between November 1999 and September 2000.

Treatment	11/99	12/99	1/00	2/00	3/00	4/00	5/00	6/00	7/00	8/00	9/00
Imidacloprid^y	7.13 a	3.93 a	5.35 a	0.91 a	4.64 a	2.38 a	1.32 a	2.70 a	17.4 a	0.58 a	1.63 a
Combination^x	4.99 a	6.30 a	8.67 ab	3.38 bc	4.55 a	3.25 a	4.04 a	9.37 a	21.4 a	3.13 a	3.84 ab
Oxydemeton-methyl^w	15.6 b	11.22 b	10.3 bc	3.27 bc	6.70 a	5.37 b	8.10 b	19.9 b	21.2 a	0.49 a	7.71 b
Untreated	22.1 b	15.55 b	15.82 c	4.44 c	4.69 a	2.64 a	4.36 a	9.75 a	20.3 a	2.60 a	7.41 b

↵z Means followed by the same letter are not significantly different at the 5% level (Fisher’s PLSD).
↵y Imicide® 3 mL 10% active ingredient per 5-cm trunk diameter.
↵x Imicide® 2mL 10% active ingredient and Injecticide® 3 mL 50% active ingredient per 5-cm trunk diameter.
↵w Injecticide® 3mL 50% active ingredient per 5-cm trunk diameter.