The 2012 RUFORUM Biennial Conference is the third in the series. The main objective of the Biennial conferences is to provide a platform for agricultural research for development stakeholders in Africa and beyond to actively exchange findings and experiences, while at the same time learning lessons towards improving performance of the agricultural sector and ultimately people’s livelihoods. The biennial conference is RUFORUM’s most comprehensive meeting for the diversity of stakeholers in agriculture. It is especially dedicated to graduate students and their supervisors, grantees in RUFORUM member universities and alumni. It is a platform for peer review, quality control, mentorship, networking and shared learning. The third Biennial Conference was attended by 657 participants.This record contains an extended abstract accepted under the theme of Integrated Crop Management
Effects of Botanical Insecticides on the Egg Parasitoid Trichogramma Cacoeciae Marchal (Hym. Trichogrammatidae)
Abstract:
This study was carried out to test the effect of the botanicals
azadrichtine and Quassin on the parasitoid Trichogramma
cacoeciae. For each of these, 2 formulatons were used i.e.,
Neemazal T/s Blank and Celaflor for azadrichtine and Alcohlic
and Water extracts for Quassin. In the study, adults (susceptible
life stage) of Trichogramma were exposed to glass plates
sprayed by the respective formulations or to host eggs sprayed
with the botanical formulations immediately after drying or after
6 days. The effect of time of egg spraying after parasitising
was also studied. Residues of Neemazal formulations on glass
plates harmful (Neemazal-Blank) or moderately harmful
(Celaflor) to T. cacoeciae adults. The two Quassin
formulations tested were harmless. When treated host eggs
were offered to adults T. cacoeciae, all the chemicals were
almost harmless. All tested insecticides significantly reduced
pupation, with the effect being maximum when host eggs where
sprayed two days after parasitism. It is therefore concluded
that both Azadirachtine and Quassin are relatively safe towards
T. cacoeciae and could therefore be used in combination with
Trichogramma releases in the management of lepidopteran
pests.
Cette étude a été réalisée pour tester l’effet de l’azadrichtine
des plantes et la quassine sur le parasitoïde
Trichogrammacacoeciae. Pour chacune d’entre-elles, 2
formulations ont été utilisées. Il s’agit de NeemAzal T/s Blank
et Celaflor pour azadrichtine et des extraits d’alcool et de l’eau
pour quassine. Dans l’étude, les adultes (stade de la vie sensible)
de Trichogramma ont été exposés à des plaques de verre
traitées par les formulations respectives ou aux oeufs de hotes
pulvérisés avec des formulations botaniques immédiatement
après le séchage ou après 6 jours. L’effet du temps de l’oeuf
après la pulvérisation parasitant a également été étudié. Lesrésidus de formulations NeemAzal sur les plaques de verre
étaient nuisibles (NeemAzal-Blank) ou modérément nocifs
(Celaflor) pour les adultes de T. cacoeciae. Les deux
formulations testées de Quassine étaient inoffensives. Lorsque
les oeufs traités des hotes ont été offerts aux adultes de T.
cacoeciae, tous les produits chimiques étaient presque
inoffensifs. Tous les insecticides testés ont réduit
considérablement la nymphose, l’effet étant maximal lorsque
les oeufs des hôtes étaient pulvérisés deux jours après le
parasitisme. On conclut donc qu’ensemble l’azadirachtine et la
Quassine sont relativement sûres vers T. cacoeciae et
pourraient ainsi être utilisées en combinaison avec les versions
de trichogrammes dans la gestion des lépidoptères ravageurs.
Language:
English
Extended abstracts submitted under Integrated Crop Management
Date of publication:
2012
Country:
Region Focus:
North Africa
Collection:
RUFORUM Conferences and Workshops
Agris Subject Categories:
Agrovoc terms:
Additional keywords:
Licence conditions:
Open Access
Access restriction:
Form:
Printed resource
Publisher:
Notes:
