There were also indications of superparasitism, as six beetles contained two larvae, and one beetle contained three. Parasitism levels dropped in 1994, averaging just 1.4 percent with a range of 0.0 to 6.5 percent among sites. If the establishment of H. axyridis in the U.S. was the result...
For second, third and fourth instar H. axyridis larvae, the successful attack rates were 0.75 ± 0.22, 1.06 ± 0.11, and 1.04 ± 0.26, respectively; the handling times were 18.08 ± 5.37, 0.45 ± 0.07, and 0.24 ± 0.07 h, respectively; and the ...
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1). Larger, later stage larvae tunnel deep into the heartwood, where they continue feeding and complete development. Adults are comparatively short-lived external feeders, consuming small amounts of tissue from host tree leaves and twigs [4]. Fig. 1 A. glabripennis, the Asian longhorned ...
Toxicity of two ecdysone agonists, halofenozide and methoxyfenozide, against the multicoloured Asian lady beetle Harmonia axyridis (Col., Coccinellidae) The insecticidal activity of two ecdysone agonists, methoxyfenozide (RH-2485) and halofenozide (RH-0345), was tested against last-instar larvae of ...
The Asian longhorned beetle is a black insect with white speckles that grows a long antenna. The beetle chews its way into hardwood trees to lay eggs. The eggs produce larvae and those larvae tunnel deep under the bark and feed on living tree tissue. This feeding effectively cuts off the ...
A well developed shoot with pale green leaves was randomly selected from each sample tree and all live CLM larvae were counted on five expanded leaves. All data were subjected to ANOVA to evaluate treatment effects on ACP, CLM, and lady beetle numbers and means were separated using LSD (P ...
Harmonia axyridis (Coleoptera: Coccinellidae) is known to prey on D. citri nymphs; we investigated the predation capacity and functional response of H. axyridis on adult D. citri. H. axyridis larvae exhibited Holling's type II functional response to different densities of adult D. citri. For ...
Abamectin was highly toxic to eggs, larvae, pupae, and adult ladybirds at rates under 18.4 mg [AI]/L. However, recommended doses of other acaricides were very safe to all stages except for the egg stage of H. axyridis. The fungicide pyrazophos was highly toxic to eggs and larvae at ...
Three groups of larvae received laboratory-reared diets: (i) eggs of Anagasta kuehniella (Zeller) (Ak); (ii) eggs of Sitotroga cerealella (Olivier) (Sc); and (iii) eggs of A. kuehniella + S. cerealella at the proportion 1:1; and one group received wild-caught cotton aphids, Aphis ...