scholarly journals Factors Influencing Insecticide Efficacy against Armored and Soft Scales

2018 ◽  
Vol 28 (3) ◽  
pp. 267-275 ◽  
Author(s):  
Carlos R. Quesada ◽  
Adam Witte ◽  
Clifford S. Sadof
Keyword(s):  
Ornamental Plants ◽  
Scale Insects ◽  
Pine Needle ◽  
Pesticide Application ◽  
Juvenile Period ◽  
First Instar ◽  
Insecticide Efficacy ◽  
Aspidiotus Nerii ◽  
Calico Scale ◽  
Phloem Feeding

Scale insects (Hemiptera: Coccoidea) are among the most economically important pests of ornamental plants. Soft scales (Coccidae) are phloem-feeding insects that produce large amounts of honeydew. By contrast, armored scales (Diaspididae) feed on the contents of plant cells and produce a waxy test that covers their bodies. We studied two species of armored scales [pine needle scale (Chionaspis pinifoliae) and oleander scale (Aspidiotus nerii)] and two species of soft scales [calico scale (Eulecanium cerasorum) and striped pine scale (Toumeyella pini)] to compare efficacy of selected insecticides. In addition, we assessed how the duration of first instar emergence might influence insecticide efficacy. Several reduced-risk insecticides (chlorantraniliprole, pyriproxyfen, spiromesifen, and spirotetramat), horticulture oil, and two broad-spectrum insecticide standards (bifenthrin and dinotefuran) were evaluated. Efficacy of insecticides was consistent within each scale family. Bifenthrin and pyriproxyfen were the only insecticides that killed soft scale insects. By contrast, all insecticides killed armored scales when the crawler stage was the target of application. Armored and soft scales may differ in susceptibility to pesticides because of likely differences in the chemical composition of their integuments and covers. Finally, we found that the effectiveness of a single application of insecticide declined by >15% when the duration of the crawling juvenile period was increased from 1 to 4 weeks. Increases in duration of a scale crawling period decreased the efficacy of a pesticide application.

scholarly journals Efficacy of Horticultural Oil and Insecticidal Soap against Selected Armored and Soft Scales

2017 ◽  
Vol 27 (5) ◽  
pp. 618-624 ◽  
Author(s):  
Carlos R. Quesada ◽  
Clifford S. Sadof
Keyword(s):  
Insect Pests ◽  
Chemical Properties ◽  
Scale Insects ◽  
Effective Management ◽  
Pine Needle ◽  
Soft Scale ◽  
Armored Scale ◽  
Aspidiotus Nerii ◽  
High Control ◽  
Calico Scale

Insecticidal soap and horticultural oil have the potential to kill individuals within populations of soft-bodied insect pests by suffocation. However, scientific literature is inconsistent about the efficacy of insecticidal soaps and petroleum-based oils against armored scale (Hemiptera: Diaspidae) and soft scale (Hemiptera: Coccidae). We examined the efficacy of horticultural oil and insecticidal soap against armored and soft scales at different developmental life stages. Studies were conducted in the laboratory and field with two species of armored scale [pine needle scale (Chionaspis pinifoliae) and oleander scale (Aspidiotus nerii)] and two species of soft scale [calico scale (Eulecanium cerasorium) and striped pine scale (Toumeylla pini)]. All insecticide applications were made at a rate of 2 gal per 100 gal water. Our laboratory results suggested that horticultural oil and insecticidal soap killed both calico scale (73% and 93%, respectively) and oleander scale (67% and 78%, respectively) when insecticides targeted 1-day-old scales. Scale insects built up tolerance to both materials over time after they settled. However, our field data indicated that horticultural oil had high control of settled armored scale [oleander scale (90%) and pine needle scale (83%)], but failed to control settled soft scale [stripe pine scale (5%)]. Insecticidal soap reduced armored scale [oleander scale (54%)]. Neither horticultural oil nor insecticidal soap significantly reduced populations of adult armored or soft scales compared with a control. Overall, horticultural oil killed a greater percentage of armored scales than soft scales, whereas insecticidal soap gave greater control against soft scales. We suggest that differences were driven by chemical properties of both insect integuments and insecticides. The waxy cover of an armored scale might reduce penetration of polar insecticidal soap whereas polar integument of a soft scale might impede infiltration of the lipophilic horticultural oil. Consequently, timing application to crawler stage is important for effective management of armored or soft scale with horticultural oils and insecticidal soaps.

Bionomics of the pine needle scale (Hemiptera: Diaspididae), an emerging pest in Christmas tree (Pinaceae) plantations in southern Québec, Canada

2018 ◽  
Vol 150 (5) ◽  
pp. 632-636 ◽  
Author(s):  
Jean-Frdéric Guay ◽  
Amy Bernier-Desmarais ◽  
Jean-François Doherty ◽  
Conrad Cloutier
Keyword(s):  
Life Cycle ◽  
Scale Insects ◽  
Tree Plantations ◽  
Christmas Tree ◽  
Pine Needle ◽  
Abies Fraseri ◽  
Fraser Fir ◽  
Christmas Trees ◽  
Significant Damage ◽  
The Status

AbstractThe pine needle scale, Chionaspis pinifoliae (Fitch) (Hemiptera: Diaspididae), has the status of an emerging pest in Christmas tree (Pinaceae) plantations in Québec, Canada. The scale is not known to cause any significant damage yet and is not generally monitored by growers. However, it can be an obstacle for exportation to Christmas tree markets where scale insects are strictly regulated. In this study, we describe its life cycle in Christmas tree plantations in southern Québec. We confirm the presence of both parthenogenetic and sexual forms of the scale on Fraser fir Abies fraseri (Pursh) Poiret (Pinaceae) grown as Christmas trees, and of parasitoid and Coccinellidae (Coleoptera) specialists that could contribute to its control.

scholarly journals Non-indigenous scale insects on ornamental plants in Bulgaria and China: A survey

2017 ◽  
Vol 19 (2) ◽  
pp. 114 ◽  
Author(s):  
K. Trencheva ◽  
G. Trenchev ◽  
R. Tomov ◽  
S.-A. Wu
Keyword(s):  
Host Plants ◽  
Ornamental Plants ◽  
Scale Insect ◽  
Scale Insects ◽  
Insect Species ◽  
First Report ◽  
The Family

A preliminary list of non-indigenous scale insect species on ornamental plants in Bulgaria and China is presented. The sampling was done between April and November, 2009, in the framework of the project “Invasive scale insects on ornamental plants in Bulgaria and China”. The insects were collected in nurseries, parks, gardens, botanical collections and greenhouses. Representatives from four families have been identified in Bulgaria, the most numerous of which are the Diaspididae (eight species), Coccidae (four species), Pseudococcidae (two species) and Margarodidae (one species). Three species of non-indigenous scale insects associated with ornamental plants were collected in China, all belonging to the family Pseudococcidae. A list of alien scale insect species on ornamental plants is given, including the sampling sites, host plants on which they were found, origin and first report in both countries.

Nectria flammea. [Descriptions of Fungi and Bacteria].

1981 ◽  
Author(s):  
C. Booth
Keyword(s):  
South Africa ◽  
New Zealand ◽  
Geographical Distribution ◽  
New Guinea ◽  
Scale Insects ◽  
Wide Range ◽  
Aspidiotus Nerii ◽  
Pseudaulacaspis Pentagona

Abstract A description is provided for Nectria flammea. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: The fungus occurs on a variety of scale insects, Aspidiotus nerii, Hemiberlesia rapax (53, 1-694), Pseudaulacaspis pentagona (55, 2093) etc. on a wide range of hosts, Acacia, Brachyglottis, Camellia, Citrus, Coffea, Morus, Ribes, Salix, Thea, Weinmannia, etc. GEOGRAPHICAL DISTRIBUTION: Australia, Belize, Fiji, India, Japan, New Zealand, Papua and New Guinea, Tanzania, Tonga, Uganda, South Africa, Sarawak, Zambia. TRANSMISSION: Airborne by ascospores or by moisture droplets as conidia.

Taxonomic revision of the myrmecophilous, meliponiphilous and rhizophilous soft scale genus Cryptostigma Ferris (Hemiptera: Coccoidea: Coccidae)

Zootaxa ◽  
2019 ◽  
Vol 2709 (1) ◽  
pp. 1 ◽  
Author(s):  
TAKUMASA KONDO
Keyword(s):  
New Species ◽  
Host Plants ◽  
New World ◽  
Taxonomic Revision ◽  
Scale Insects ◽  
Biological Information ◽  
World Species ◽  
Soft Scale ◽  
Adult Females ◽  
First Instar

The present study revises the soft scale insects of the genus Cryptostigma Ferris (Hemiptera: Coccoidea: Coccidae), which comprises a group of New World species associated with ants or bees or of hypogeal habit. It includes 17 species, of which 10 species are new to science. The study is based on the external, mostly cuticular morphology of the adult females and first-instar nymphs. Taxonomic keys based on adult females and known first-instar nymphs are provided. For each species a description or redescription is given, followed by information on its distribution, host plants, and known biological information including associated ants or bees. The new species described are Cryptostigma chacoensis sp. nov., C. gullanae sp. nov., C. jonmartini sp. nov., C. longinoi sp. nov., C. melissophilum sp. nov., C. mexicanum sp. nov., C. philwardi , sp. nov. C. rhizophilum sp. nov., C. serratum sp. nov., and C. tuberculosum sp. nov. Neolecanium urichi (Cockerell) is transferred to Cryptostigma as C. urichi (Cockerell) comb. nov., and C. quinquepori (Newstead) is synonymized with Cryptostigma urichi, comb. nov. Lectotypes are designated for Cryptostigma saundersi Laing, Lecanium silveirai Hempel, Lecanium urichi Cockerell and Akermes quinquepori Newstead. Cryptostigma inquilina (Newstead) is amended to C. inquilinum in order to match the neutral ending “stigma”. The following names are treated as nomina nuda: Cryptostigma jamaicensis and Lecanopsis jamaicensis (Ben-Dov, 1993: 97).

Taxonomy of Toumeyella lomagundiae Hall and T. obunca De Lotto, and their transfer to Hallicoccus gen. nov. (Hemiptera: Coccoidea: Coccidae)

Zootaxa ◽  
2007 ◽  
Vol 1415 (1) ◽  
pp. 23-33
Author(s):  
TAKUMASA KONDO
Keyword(s):  
Instar Nymph ◽  
Scale Insects ◽  
Soft Scale ◽  
Taxonomic Key ◽  
Adult Females ◽  
First Instar

Two African soft scale insects, Toumeyella lomagundiae Hall and T. obunca De Lotto, are transferred to Hallicoccus gen. nov. The adult females of both species are redescribed, and the first-instar nymph of T. lomagundiae is described. A revised taxonomic key to separate the adult females is provided. The affinity of Hallicoccus gen. nov. with the genus Toumeyella Cockerell is briefly discussed.

scholarly journals Suitability of Five Horticulturally Important Armored Scale Insects as Hosts for an Exotic Predaceous Lady Beetle1

1993 ◽  
Vol 11 (1) ◽  
pp. 28-30 ◽  
Author(s):  
Brenda C. Bull ◽  
Michael J. Raupp ◽  
Mark R. Hardin ◽  
Clifford S. Sadof
Keyword(s):  
Pupal Stage ◽  
The United States ◽  
Scale Insects ◽  
Armored Scale ◽  
Aspidiotus Nerii ◽  
Pseudaulacaspis Pentagona ◽  
Chilocorus Kuwanae ◽  
San Jose Scale ◽  
White Peach Scale ◽  
Euonymus Scale

Abstract Chilocorus kuwanae (Sylvestri) was imported from Korea to the United States for release against the euonymus scale (Unaspis euonymi (Comstock)). Field observations suggest that C. kuwanae feeds on a number of other armored scale insects, including white peach scale (Pseudaulacaspis pentagona (Targionni-Tozzeti)) and obscure scale (Melanaspis obscura (Comstock)). However, such observations have not been rigorously examined under controlled conditions. Our laboratory investigations indicate that C. kuwanae survives and reproduces well on San Jose scale (Quadraspidiotus perniciosus (Comstock)), in addition to euonymus scale. Fecundity was reduced in adults fed white peach scale. Few larvae survived to adulthood when fed oleander scale (Aspidiotus nerii (Bouche)). Adults failed to reproduce on obscure scale; none of the larvae fed this host survived to the pupal stage.

scholarly journals Natural enemies of armored scales (Hemiptera: Diaspididae) and soft scales (Hemiptera: Coccoidae) in Chile: molecular and morphological identification

2018 ◽  
Author(s):  
P. Amouroux ◽  
D. Crochard ◽  
M.C.G. Correa ◽  
G. Groussier ◽  
P. Kreiter ◽  
...  
Keyword(s):  
Biological Control ◽  
Natural Enemies ◽  
Ornamental Plants ◽  
Integrative Taxonomy ◽  
Scale Insects ◽  
Morphological Identification ◽  
Correct Identification ◽  
Predator Species ◽  
Control Programs ◽  
First Time

AbstractScale insects (Hemiptera: Coccoidea) are key pests of agricultural crops and ornamental plants worldwide. Their populations are difficult to control, even with insecticides, due to their cryptic habits. Moreover, there is growing concern over the use of synthetic pesticides for their control, due to deleterious environmental effects and the emergence of resistant populations of target pests. In this context, biological control may be an effective and sustainable approach. Hymenoptera Chalcidoidea includes natural enemies of scale insects that have been successfully used in many biological control programs. However, the correct identification of pest scale species and their natural enemies is particularly challenging because these insects are very small and highly specialized. Integrative taxonomy, coupling DNA barcoding and morphological analysis, has been successfully used to characterize pests and natural enemy species. In this study, we performed a survey of parasitoids and predators of armored and soft scales in Chile, based on 28S and COI barcodes. Fifty-three populations of Diaspididae and 79 populations of Coccidae were sampled over the entire length of the country, from Arica (18°S) to Frutillar (41°S), between January 2015 and February 2016. The phylogenetic relationships obtained by Bayesian inference from multilocus haplotypes revealed 40 putative species of Chalcidoidea, five Coccinellidae and three Neuroptera. In Chalcidoidea, 22 species were identified morphologically, resulting in new COI barcodes for 12 species and new 28S barcodes for 14 species. Two predator species (Rhyzobius lophantae and Coccidophilus transandinus) were identified morphologically, and two parasitoid species, Chartocerus niger and Signiphora bifasciata, were recorded for the first time in Chile.

scholarly journals Incidence of armoured scale insects on persimmons

2000 ◽  
Vol 53 ◽  
pp. 211-215
Author(s):  
A.R Tomkins ◽  
D.J. Wilson ◽  
C. Thomson ◽  
P. Allison
Keyword(s):  
Species Composition ◽  
Common Species ◽  
Scale Insects ◽  
Diospyros Kaki ◽  
Persimmon Fruit ◽  
Growing Seasons ◽  
Aspidiotus Nerii ◽  
Armoured Scale Insects

The incidence of armoured scale insects infesting persimmons (Diospyros kaki) grown in five districts (Whangarei (Northland) Pukekohe (South Auckland) Morrinsville (Waikato) Maketu (Bay of Plenty) and Gisborne (Poverty Bay)) was investigated over three growing seasons (1995/96 1996/97 and 1997/98) Three species of armoured scale insects were found on persimmon fruit greedy scale (Hemiberlesia rapax) latania scale (H lataniae) and oleander scale (Aspidiotus nerii) The species composition differed between districts with latania scale the most common species recorded overall Fruit were infested by the first and second generations of all three species Latania scale infested a higher proportion of leaves than fruit

scholarly journals High pressure air for pest removal from kiwifruit

2017 ◽  
Vol 70 ◽  
pp. 315
Author(s):  
A.B. Woolf ◽  
N.E.M. Page-Weir ◽  
R.J. Oliver ◽  
A.J. Hawthorne ◽  
A. Chhagan ◽  
...  
Keyword(s):  
High Pressure ◽  
Scale Insects ◽  
Pressure System ◽  
Noticeable Effect ◽  
First Instar ◽  
Wide Range ◽  
Low Pressure System ◽  
The Difference ◽  
Physical Treatments ◽  
Air Knife

Insect removal from kiwifruit is important for improving access to overseas markets. Insect removal from kiwifruit by physical treatments such as high pressure washing is hugely successful but kiwifruit packing is carried out “dry”. Therefore, one potential option is the use of ‘air-knife’ blowers to remove insects. A system with air-knives from the sides and top that was mounted over a single-lane Compac grader was able to remove over 90% of artificially inoculated diapausing two-spotted mites (≈ 85/fruit). The difference in pest levels between untreated ‘Hayward’ kiwifruit fruit naturally infested with a wide range of insects (n=2194) and fruit exposed to air-knives (n=2204) was: mealybug 100%, beetle/weevils 91—100%, oribatid mites 93%, tuckerellid mites 98%, unidentified mites 88% , booklice 86%, thrips 74— 100%, Collembola 63%, cockroaches 100%, spiders 43%, scale insects 40%. Air-knives had no noticeable effect on ‘Hayward’ or ‘Zesy002’ (Gold3) fruit quality. These results indicate that air-knives using a high air-flow/low-pressure system can effectively remove high rates of “mobile” insects and first-instar scale insects, and can probably be implemented logistically and economically from a commercial perspective.

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