scholarly journals HORMONAL CONTROL OF REVERSIBLE DEGENERATION OF FLIGHT MUSCLE IN THE COLORADO POTATO BEETLE, LEPTINOTARSA DECEMLINEATA SAY (COLEOPTERA)

1963 ◽  
Vol 19 (3) ◽  
pp. 519-527 ◽  
Author(s):  
D. Stegwee ◽  
E. C. Kimmel ◽  
J. A. de Boer ◽  
S. Henstra
Keyword(s):  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Flight Muscle ◽  
Hormonal Control ◽  
Corpora Allata ◽  
Endocrine Glands ◽  
Potato Beetle ◽  
Leptinotarsa Decemlineata Say ◽  
Flight Muscles ◽  
New Formation

In the hibernating (diapausing) Colorado potato beetle, Leptinotarsa decemlineata Say, the flight muscles show pronounced degeneration. The muscle fibrils are greatly reduced in diameter and the sarcosomes are virtually absent. Similar signs of degeneration could be produced by extirpation of the postcerebral complex of endocrine glands, the corpora cardiaca and corpora allata. Reimplantation of active postcerebral complexes resulted in a very rapid regeneration of the muscle fibrils and new formation of sarcosomes.

Breaking a paradigm: male-produced aggregation pheromone for the Colorado potato beetle

2002 ◽  
Vol 205 (13) ◽  
pp. 1925-1933
Author(s):  
Joseph C. Dickens ◽  
James E. Oliver ◽  
Benedict Hollister ◽  
John C. Davis ◽  
Jerome A. Klun
Keyword(s):  
Aggregation Pheromone ◽  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Combined Treatment ◽  
Feedback System ◽  
Hormonal Control ◽  
Male And Female ◽  
Potato Beetle ◽  
Leptinotarsa Decemlineata Say ◽  
Laboratory Bioassays

SUMMARY A male-produced aggregation pheromone was identified for the Colorado potato beetle Leptinotarsa decemlineata (Say) (Coleoptera:Chrysomelidae). While male beetles produced only minor amounts of the pheromone, its production could be enhanced by topical application of juvenile hormone III (JH III) (eightfold), by antennectomy (40-fold) or by the combined treatment of JH III and antennectomy (almost 200-fold); this enhancement enabled the identification of the compound as(S)-3,7-dimethyl-2-oxo-oct-6-ene-1,3-diol [(S)-CPB I], a unique structure for an insect pheromone. Antennal receptors of both sexes responded selectively to the (S)-enantiomer. Both male and female Colorado potato beetles were attracted to serial source loads of(S)-CPB I in laboratory bioassays; (R)-CPB I was inactive or inhibitory, as demonstrated by the inactivity of the racemate. This is the first identification of a pheromone for the Colorado potato beetle and differs from the paradigm of a female-produced pheromone for this insect. The attractant is also the first male-produced pheromone identified for the Chrysomelidae. The discovery that both JH III and antennectomy increase levels of the pheromone (S)-CPB I indicates the existence of a feedback system involving antennal input, and this system may be under hormonal control.

THE EFFECT OF WATER STRESS AND LEAFLET SIZE ON THE DENSITY OF TRICHOMES AND THE RESISTANCE TO COLORADO POTATO BEETLE LARVAE (LEPTINOTARSA DECEMLINEATA [SAY]) IN SOLANUM BERTHAULTII HAWKES

1990 ◽  
Vol 122 (6) ◽  
pp. 1141-1147 ◽  
Author(s):  
Yvan Pelletier
Keyword(s):  
Water Stress ◽  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Solanum Berthaultii ◽  
Abaxial Surface ◽  
First Instar ◽  
Potato Beetle ◽  
Resistance To Insects ◽  
Leptinotarsa Decemlineata Say ◽  
Growing Conditions

AbstractSolanum berthaultii Hawkes bears trichomes reportedly providing resistance to insects. Results indicated that the density of types A and B trichomes was linearly related to the inverse of the leaflet area. The number of trichomes on the adaxial and on the abaxial surface of terminal leaflets was not affected by two levels of water stress or by growing conditions in the greenhouse or the field. The leaflets of the water-stressed plants were generally smaller and, consequently, the density of trichomes higher.The survival of first-instar Colorado potato beetle larvae was similar on S. berthaultii grown under varying drought conditions and on leaves from field-grown plants bearing different densities of trichomes.

scholarly journals Screening test for detection of Leptinotarsa decemlineata (Say) sensitivity to insecticides

2012 ◽  
Vol 27 (1) ◽  
pp. 59-67
Author(s):  
Dusanka Indjic ◽  
Slavica Vukovic ◽  
Snezana Tanaskovic ◽  
Mila Grahovac ◽  
Tatjana Keresi ◽  
...  
Keyword(s):  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Screening Test ◽  
Rapid Assessment ◽  
Potato Beetle ◽  
Highly Sensitive ◽  
Leptinotarsa Decemlineata Say ◽  
Two Populations ◽  
Insight Into

In 2009, the sensitivity of 15 field populations of Colorado potato beetle (Leptinotarsa decemlineata Say.) - CPB was assessed to chlorpyrifos, cypermethrin, thiamethoxam and fipronil, four insecticides which are mostly used for its control in Serbia. Screening test that allows rapid assessment of sensitivity of overwintered adults to insecticides was performed. Insecticides were applied at label rates, and two, five and 10 fold higher rates by soaking method (5 sec). Mortality was assessed after 72h. From 15 monitored populations of CPB, two were sensitive to label rate of chlorpyrifos, one was slightly resistant, 11 were resistant and one population was highly resistant. Concerning cypermethrin, two populations were sensitive, two slightly resistant, five were resistant and six highly resistant. Highly sensitive to thiamethoxam label rate were 12 populations, while three were sensitive. In the case of fipronil applied at label rate, two populations were highly sensitive, six sensitive, one slightly resistant and six were resistant. The application of insecticides at higher rates (2, 5 and 10 fold), that is justified only in bioassays, provided a rapid insight into sensitivity of field populations of CPB to insecticides.

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