ABSTRACT
Crucifers form an important component of the livelihood of small-scale farmers in
East Africa but diamondback moth (DBM) pest constrains their production. Attempts to
control the pest by use of host plant resistance (HPR) have been modest especially in
cultivars expressing a whitish appearance (normal wax bloom). Conversely, crucifers
characterized by their shiny dark green leaves (Glossy) have shown some resistance to
DBM. As a consequence, several seed companies claim resistance attributes in their
novel cultivars. Thus, this work sought to investigate the effect of some Brassica
oleracea cultivars grown in Kenya on fecundity, development and parasitism of DBM.
The performance of DBM was compared on seven cultivars in both laboratory and
greenhouse trials. Laboratory investigations were conducted on oviposition preference
(choice, no-choice) and survivorship of DBM on the test cultivars and on the basis of
these data, life tables were constructed. Egg to adult survival, plant damage as well as
cultivar effect on parasitism by Diadegma semiclausum were studied in a plastic house.
Leaf wax quantity and structure of the adaxial leaf surfaces were evaluated via scanning
electron microscopy (SEM). While DBM did not discriminate any of the test cultivars for
oviposition in the choice test, more eggs were laid on the cultivars “Collard Georgia” and
“Green Challenger” in the no-choice test. Besides, the pest tended to oviposit a higher
percent of its eggs away from the plant while probing on “Green Challenger” in both the
choice and no - choice tests. Larval period was more than a day longer on “Riana”
“Green Challenger” and “Thousand Head” than on “Gloria” and “Collard Georgia” in the
laboratory trial, and larval survival on “Green Challenger” was greatly reduced. Pupal
weight of DBM raised on “Green Challenger” (4.3 mg) in the laboratory was
significantly lower (P
OKINYI, O (2021). Effects Of Selected Cultivated Crucifers In Kenya On Fecundity, Development And Parasitism Of Diamondback Moth, Plutella Xylostella L., (Lepidoptera: Plutellidae) By Parasitoid Diadegma Semic. Afribary. Retrieved from https://tracking.afribary.com/works/effects-of-selected-cultivated-crucifers-in-kenya-on-fecundity-development-and-parasitism-of-diamondback-moth-plutella-xylostella-l-lepidoptera-plutellidae-by-parasitoid-diadegma-semiclausum-
OKINYI, OLWASI "Effects Of Selected Cultivated Crucifers In Kenya On Fecundity, Development And Parasitism Of Diamondback Moth, Plutella Xylostella L., (Lepidoptera: Plutellidae) By Parasitoid Diadegma Semic" Afribary. Afribary, 13 May. 2021, https://tracking.afribary.com/works/effects-of-selected-cultivated-crucifers-in-kenya-on-fecundity-development-and-parasitism-of-diamondback-moth-plutella-xylostella-l-lepidoptera-plutellidae-by-parasitoid-diadegma-semiclausum-. Accessed 23 Nov. 2024.
OKINYI, OLWASI . "Effects Of Selected Cultivated Crucifers In Kenya On Fecundity, Development And Parasitism Of Diamondback Moth, Plutella Xylostella L., (Lepidoptera: Plutellidae) By Parasitoid Diadegma Semic". Afribary, Afribary, 13 May. 2021. Web. 23 Nov. 2024. < https://tracking.afribary.com/works/effects-of-selected-cultivated-crucifers-in-kenya-on-fecundity-development-and-parasitism-of-diamondback-moth-plutella-xylostella-l-lepidoptera-plutellidae-by-parasitoid-diadegma-semiclausum- >.
OKINYI, OLWASI . "Effects Of Selected Cultivated Crucifers In Kenya On Fecundity, Development And Parasitism Of Diamondback Moth, Plutella Xylostella L., (Lepidoptera: Plutellidae) By Parasitoid Diadegma Semic" Afribary (2021). Accessed November 23, 2024. https://tracking.afribary.com/works/effects-of-selected-cultivated-crucifers-in-kenya-on-fecundity-development-and-parasitism-of-diamondback-moth-plutella-xylostella-l-lepidoptera-plutellidae-by-parasitoid-diadegma-semiclausum-