Effects Of Selected Cultivated Crucifers In Kenya On Fecundity, Development And Parasitism Of Diamondback Moth, Plutella Xylostella L., (Lepidoptera: Plutellidae) By Parasitoid Diadegma Semic

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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

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APA

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://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-

MLA 8th

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://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 28 Mar. 2024.

MLA7

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. 28 Mar. 2024. < https://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- >.

Chicago

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 March 28, 2024. https://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-