Toxicity Studies of So-Called “Inert” Materials With the Bean Weevil, Acanthoscelides obtectus (Say)*

Effects of contact insecticides pirimifos-methyl and deltamethrin of Indian meal moth Plodia interpunctella Hbn. and Angoumois grain moth Sitotroga cerealella Oliv. in maize, and on bean weevil Acanthoscelides obtectus Say in beans were examined 6 and 18 months after treatment in laboratory environment. Using appropriate methods (EPPO and other), maize and bean were treated with recommended and double rates of the insecticide products: EC formulation of pirimifos-methyl and EC formulation and dust of deltamethrin. After 6 and 18 months, we examined the mortality of P. interpunctella larvae, and 5. cerealella and A. obtectus adults following 2,7 and 14 days of contact with the treated material. In Angoumois grain moth and bean weevil, the resulting progeny was monitored up to FI generation. Both insecticides achieved full mortality of P. interpunctella larvae on the 6-month-old deposit. On the 18-months-old deposit, the same result was achieved with deltamethrin dust (both rates), as well as with pirimifosmethyl and deltamethrin (EC formulation) at the double recommended rates. S. cerealella mortality was 100% for both insecticides and both deposit ages. Regarding A. obtectus, full mortality of adults was found after contact with pirimifos-methyl and deltamethrin dust, while deltamethrin liquid caused low mortality of bean weevil, especially the 18-months-old deposit. FI generation adults of Angoumois grain moth and bean weevil were found only on 18-months-old deposits of the recommended rates of deltamethrin dust and pirimifos-methyl. The tested contact insecticides can provide very long prevention and control of Indian meal moth and Angoumois grain moth in stored maize and bean weevil in stored beens.

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The composition of cuticular hydrocarbons of the bean weevil, Acanthoscelides obtectus say

Comparative Biochemistry and Physiology Part B Comparative Biochemistry ◽

10.1016/0305-0491(87)90363-4 ◽

1987 ◽

Vol 88 (2) ◽

pp. 681-685 ◽

Cited By ~ 2

Author(s):

E. Dubis ◽

E. Maliński ◽

E. Hebanowska ◽

E. Synak ◽

K. Pihlaja ◽

...

Keyword(s):

Cuticular Hydrocarbons ◽

Bean Weevil ◽

Acanthoscelides Obtectus ◽

Acanthoscelides Obtectus Say

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Malathion and Deltamethrin efficacy in controlling Acanthoscelides obtectus say weevil during long storage of beans

Pesticidi ◽

10.2298/pif0301023k ◽

2003 ◽

Vol 18 (1) ◽

pp. 23-32

Author(s):

Petar Kljajic ◽

Nada Milosevski ◽

Ilija Peric

Keyword(s):

Storage Period ◽

Storage Conditions ◽

Adult Mortality ◽

Bean Weevil ◽

Acanthoscelides Obtectus ◽

Generation Progeny ◽

Full Protection ◽

Acanthoscelides Obtectus Say ◽

Contact Insecticides ◽

F1 Generation

Efficacy of Malathion and Deltamethrin contact insecticides in controlling Acanthoscelides obtectus Say bean weevil over a period of 12 months following treatment in laboratory conditions (simulating storage conditions) was investigated. Using appropriate methods (EPPO and other), beans were treated with recommended amounts of Malathion - and Deltamethrin-based insecticide powders. Over a period of 12 months, bioassay was used to determine A. obtectus adult mortality after 2, 7 and 14 days of contact with treated material. Additionally, potential occurrence of F1 generation progeny was monitored over the 14 days of contact with insecticides. The results show that, regardless of the age of Malathion and Deltamethrin deposits, two and seven days of contact with treated beans was insufficient to achieve full mortality of bean weevils, while their mortality was total (100%) after 14 days of contact, the only exception being a Malathion deposit aged 240 days and Deltamethrin deposit aged 90 and 360 days. After 14 days of contact with all Malathion and Deltamethrin deposits on beans and additional 7 days of recovery on untreated material, the mortality of bean weevil adults was total. Weevil adults of F1 generation were found only on Malathion deposits aged 240 and 360 days, while no progeny was registered on Deltamethrin deposits. The tested contact insecticides, applied as powder formulas, can provide full protection of beans from weevils over a 12-month storage period.

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