Injury levels for soil-dwelling insects in sunflower in the Central Highlands, Queensland

Murray, D. A. H.; Wicks, R.

doi:10.1071/ea9900669

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Pseudoheteronyx sp. is undescribed although Murray and Wicks (1984) gave it the common name of "black sunflower scarab". I t is morphologically distinct from P. basicollis Lea, a pest of peanuts and other crops on the Darling Downs of Queensland (Rogers et a/.…”

Section: Introductionmentioning

confidence: 99%

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Biology of Pseudoheteronyx sp. (Coleoptera: Scarabaeidae) on the Central Highlands of Queensland

Robertson¹,

Kettle²

1994

Australian Journal of Entomology

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The life cycle, development rates, fecundity and survivorship of Pseudohereronyx sp. were studied in the laboratory and field. Adults fed on leaves of Asteraceae (sunflower and furthenium hysterophorus L., an inrroduced weed). Larvae in the soil fed on cereal roots and on crop residues but developed faster on living wheat roots compared to wheat stubble. The shortest development time for larvae was 8 months under laboratory conditions. Teneral adults appeared in the field at the start of the summer wet beason (usually December). Sex ratio was 1 : l . Size could not be used to separate the sexes, which were morphologically similar. Adults began laying eggs about 8 weeks after adult emergence. Under moist soil conditions in the laboratory, adults laid eggs for 1 year except during 4-6 weeks in winter when mean monthly temperature dropped below 20°C. When confined in groups of up to 20 adults, fseudoheleronyxsp. laid an average 18.5 eggs per female when fed sunflower leaves, and 3.0 eggs per female when fed leaves of farrheniurn. Individually confined females fed sunflower leaves laid 10-5 1 eggs during their life. Natural enemies recorded in the field included fungal pathogens (Meturhizirrrn, Beauveria, Hirsutellu and Cordyceps spp.) and milky disease (Bacillus popilliue).

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Section: Introductionmentioning

confidence: 99%

“…Before 1987, Pseudoheteronyx sp. was a minor pest on the Central Highlands (Murray and Wicks 1984). Recent spread of the introduced weed Parthenium hysterophorus L. through the cropping areas of the Central Highlands may have increased the abundance of Pseudoheteronyx sp.…”

Section: Introductionmentioning

confidence: 99%

Biology of Pseudoheteronyx sp. (Coleoptera: Scarabaeidae) on the Central Highlands of Queensland

Robertson¹,

Kettle²

1994

Australian Journal of Entomology

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Population dynamics of false wireworms (Gonocephalum macleayi, Pterohelaeus alternatus, P. darlingensis) and development of an integrated pest management program in central Queensland field crops: a review

Robertson¹

1993

Aust. J. Exp. Agric.

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False wireworms (particularly Pterohelaeus alternatus and Gonocephalum macleayi) are major pests of seedling field crops in central Queensland. Population densities are spatially and temporally dynamic, with high densities (>2/m2) of large larvae and adults generally not persisting at a location for more than 1 year. Adult movement in summer in response to changes in habitat suitability is suggested as the cause of population changes. Natural enemies, particularly entomopathogenic fungi, may also have a role in suppressing high population densities. One-half to three-quarters of fields that have grown summer crops including sorghum, sunflower, soybeans, and mungbeans in the preceding season are infested at densities that could cause economic losses in subsequent crops sown in wide rows with a low seed-sowing rate. Winter-grown wheat results in a significantly lower infestation rate (one-quarter of the fields sampled), but winter chickpea is a suitable crop for development of false wireworm infestations. Cultivation per se does not reduce numbers of false wireworms, but stubble removal may depress densities. False wireworms feed on stubble, and crop damage may be increased in low-stubble fields (following long fallows for example) despite low false wireworm numbers, due to lack of alternative food. The dynamic nature of false wireworm population size makes prediction of pest levels difficult. The presence of false wireworms should be assessed in each fallow field before planting. Management strategies based on preplanting sampling, economic injury levels, stubble management, crop rotation, and insecticide control are discussed.

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Sunflower Insects

Charlet

Brewer

Franzmann³

2015

Agronomy Monographs

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Injury levels for soil-dwelling insects in sunflower in the Central Highlands, Queensland

Cited by 3 publications

References 7 publications

Biology of Pseudoheteronyx sp. (Coleoptera: Scarabaeidae) on the Central Highlands of Queensland

Biology of Pseudoheteronyx sp. (Coleoptera: Scarabaeidae) on the Central Highlands of Queensland

Population dynamics of false wireworms (Gonocephalum macleayi, Pterohelaeus alternatus, P. darlingensis) and development of an integrated pest management program in central Queensland field crops: a review

Sunflower Insects

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