Antifeedant activity and growth inhibition effects of some plant extracts against larvae of Colorado potato beetle [Leptinotarsa decemlineata Say (Col: Chyrsomelidae)] under laboratory 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.

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Research on the Effect of Alpha-Tocopherol (vit. E) on the Growth and Reproduction of the Colorado Potato Beetle (Leptinotarsa Decemlineata Say)

The Host-Plant in Relation to Insect Behaviour and Reproduction ◽

10.1007/978-1-4613-4274-8_49 ◽

1976 ◽

pp. 303-306

Author(s):

Z. Zwołińska-Śniatałowa

Keyword(s):

Colorado Potato Beetle ◽

Leptinotarsa Decemlineata ◽

Alpha Tocopherol ◽

Potato Beetle ◽

Leptinotarsa Decemlineata Say ◽

Growth And Reproduction

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

Pesticidi i fitomedicina ◽

10.2298/pif1201059i ◽

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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