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Titolo:
The insecticidal effects of neem seed kernel extract on eggs and larvae ofHelicoverpa armigera (Hubner)
Autore:
Hassan, E;
Titolo Testata:
ZEITSCHRIFT FUR PFLANZENKRANKHEITEN UND PFLANZENSCHUTZ-JOURNAL OF PLANT DISEASES AND PROTECTION
fascicolo: 5, volume: 106, anno: 1999,
pagine: 523 - 529
SICI:
0340-8159(199909)106:5<523:TIEONS>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Keywords:
neem seed kernel extracts; Helicoverpa armigera; effects; insecticide; ovicide; control; mortality; disruption; moulting; deformation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Citazione:
E. Hassan, "The insecticidal effects of neem seed kernel extract on eggs and larvae ofHelicoverpa armigera (Hubner)", Z PFLANZENK, 106(5), 1999, pp. 523-529

Abstract

The seed kernel extract from the neem tree (Azadirachta indica) contains complex constituents that are insecticidal. Of these, azadirachtin (Aza) is known to cause a range of effects on a number of species of insects. The effects of neem seed kernel extract were studied on egg and larval development of the Corn Ear Worm, Helicoverpa armigera (Hubner), a major insect pest of field and vegetable crops in Australia, including cotton and tomatoes. This pest species has developed resistance to many insecticides and for this reason its effective control is of concern to Australian agricultural and horticultural industries. To evaluate the insecticidal efficacy on eggs and larvae when applied as acontact insecticide, eggs and second instars of Helicoverpa armigera were treated, using a Potter Spray Tower, at concentrations of 100, 150 and 200 mg/l of neem seed kernel extract containing 2.5 % azadirachtin. An artificial food source for larvae was also treated with neem seed kernel extract atthe same concentrations as those used for topical dosage, in order to evaluate its efficacy as a stomach poison. Neem seed kernel extract (neem extract) produced a range of effects on adults, eggs and larvae. Applied to eggs, neem extract caused egg mortality and deformation of subsequent larvae because of disruption to moulting between the first and second, and second and third instars. Hatching larvae behaved abnormally in that they failed to consume the eggshell. Topical application to larvae produced similarly abnormal effects in development and moulting derangement between instars. When neem extract was mixed with artificial diet as a food source, it was strongly antifeedant. The results indicated that neem has the potential to contribute to controlof H. armigera either independently or as an additive to existing conventional insecticides as a way of eliminating resistant individuals.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/20 alle ore 16:01:59