THE HAEMOLYMPH PLASMA COMPOSITION OF ADULTS, PUPAE, AND LARVAE OF THE COLORADO POTATO BEETLE, LEPTINOTARSA DECEMLINEATA (SAY), AND DEVELOPMENT OF PHYSIOLOGICAL SALINE SOLUTIONS

1992 ◽  
Vol 124 (6) ◽  
pp. 945-949 ◽  
Author(s):  
Yvan Pelletier ◽  
Catherine L. Clark
Keyword(s):  
Sodium Chloride ◽  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Physiological Saline ◽  
Plasma Composition ◽  
Potassium Sodium ◽  
Larval Stages ◽  
Potato Beetle ◽  
Leptinotarsa Decemlineata Say ◽  
Saline Solutions

AbstractHaemolymph from Colorado potato beetles at larval, pupal, and adult stages was analyzed for pH, osmolality, and concentrations of magnesium, calcium, potassium, sodium, chloride, phosphate, and citrate. Differences in the concentrations of some ions observed between stages were used to formulate physiological saline solutions for the adult and larval stages.

Is there a role for stripes of adults and colour of larvae in determining the avoidance of the Colorado potato beetle by the American toad?

2010 ◽  
Vol 88 (5) ◽  
pp. 468-478
Author(s):  
G. Boiteau ◽  
P. C. McCarthy
Keyword(s):  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Laboratory Tests ◽  
Bufo Americanus ◽  
American Toad ◽  
Larval Stages ◽  
Potato Beetle ◽  
Leptinotarsa Decemlineata Say ◽  
Toad Bufo

It has been suggested that the stripes on the elytra of the adult Colorado potato beetle ( Leptinotarsa decemlineata (Say, 1824); Coleoptera: Chrysomelidae) and the red colouration of the larvae are aposematic characters warning predators of their distastefulness as prey. The role of stripes and red colour in determining the avoidance behaviour of the American Toad ( Bufo americanus Holbrook, 1836 = Anaxyrus americanus (Holbrook, 1836); Anura: Bufonidae) for the Colorado potato beetle was investigated in a series of laboratory tests. The behaviour of toads exposed to wild Colorado potato beetles was compared with that of toads exposed to genetic mutant Colorado potato beetles without elytral stripes. Tests confirmed the distastefulness of adult and larval stages and demonstrated the development of prey avoidance (cessation of feeding in spite of hunger) combined or not to behavioural displays where the toad plants down, crouches, and turns away or shows wincing, prey dropping, and mouth gaping after snapping at the beetle. However, toads showed the same response to mutant adult beetles without stripes and to mutant larval beetles without the red colour as to wild adult beetles with stripes and to wild red larvae. Results indicate that the stripes and the red colouration of the Colorado potato beetle do not constitute aposematic characters for the toad.

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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