Thermal Requirements for Northern Corn Rootworm Egg Hatch12

Apple, J. W.; Walgenbach, E. T.; Knee, W. J.

doi:10.1093/jee/64.4.853

Cited by 9 publications

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“…The box with eggs was placed back into the growth chamber at 25°C for 45 days allowing sufficient time for incubation and hatching considering median egg hatch occurs at about 21 days under these conditions (Apple et al. ). We monitored at least twice weekly for hatching.…”

Section: Methodsmentioning

confidence: 99%

“…The viable eggs were plated out in a 10 9 10 grid onto moistened filter paper inside a 10 cm 9 10 cm 9 2 cm plastic sandwich box. The box with eggs was placed back into the growth chamber at 25°C for 45 days allowing sufficient time for incubation and hatching considering median egg hatch occurs at about 21 days under these conditions (Apple et al 1971). We monitored at least twice weekly for hatching.…”

Section: Establishing Matings and Egg Collectionmentioning

confidence: 99%

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Inheritance of an extended diapause trait in theNorthern corn rootworm,Diabrotica barberi(Coleoptera:Chrysomelidae)

French

Coates

Sappington

2012

J Applied Entomology

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Diapause is an adaptive trait that delays development or reproduction under unfavourable circumstances. The northern corn rootworm,Diabrotica barberi Smith & Lawrence, an important maize, Zea mays L., pest in the Diabroticite species complex, overwinters in diapause during the egg stage. Some NCR populations are adapted to crop rotation by expressing an extended diapause (ED) trait that delays embryonic development for 2 years. This ED trait has increased in frequency and geographic distribution since first reported in Illinois in 1932. Reciprocal single pair crosses among beetles from a laboratory colony with the ancestral 1-year diapause trait and field collected beetles with the 2-year ED trait indicated that ED females laid significantly more ED eggs than did females with the 1-year diapause trait regardless of male genotype. The ED trait was highly heritable [realized heritability (h 2 ) = 0.698 ± 0.314], with genetic dominance (D) of the trait strongly influenced by female genotype. Selection of the ED trait and maintenance of polymorphic diapause phenotypes within maize-soybean cropping systems is discussed in relation to response to a fluctuating environment and as a potentially advantageous life history adaptation. AbstractDiapause is an adaptive trait that delays development or reproduction under unfavourable circumstances. The northern corn rootworm, Diabrotica barberi Smith & Lawrence, an important maize, Zea mays L., pest in the Diabroticite species complex, overwinters in diapause during the egg stage. Some NCR populations are adapted to crop rotation by expressing an extended diapause (ED) trait that delays embryonic development for 2 years. This ED trait has increased in frequency and geographic distribution since first reported in Illinois in 1932. Reciprocal single pair crosses among beetles from a laboratory colony with the ancestral 1-year diapause trait and field collected beetles with the 2-year ED trait indicated that ED females laid significantly more ED eggs than did females with the 1-year diapause trait regardless of male genotype. The ED trait was highly heritable [realized heritability (h 2 ) = 0.698 ± 0.314], with genetic dominance (D) of the trait strongly influenced by female genotype. Selection of the ED trait and maintenance of polymorphic diapause phenotypes within maize-soybean cropping systems is discussed in relation to response to a fluctuating environment and as a potentially advantageous life history adaptation.

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Section: Methodsmentioning

confidence: 99%

Section: Establishing Matings and Egg Collectionmentioning

confidence: 99%

Inheritance of an extended diapause trait in theNorthern corn rootworm,Diabrotica barberi(Coleoptera:Chrysomelidae)

French

Coates

Sappington

2012

J Applied Entomology

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“…Under such conditions, the eggs often are colonized by a species complex of fungi. Many reports indicate the serious nature of infestation of corn rootworm eggs by fungi (e.g., Cunningham & Peters, 1964;George & Ortman, 1965;Apple et aL, 1971 ;Wilde et al, 1972;Krysan et al, 1977). A large volume of literature also exists on surface sterilization of insect eggs (e.g., Martignoni & Milstead, 1960;Getzin, 1962;Ignoffo, 1963;Nettles & Betz, 1966;Rose & McCabe, 1973;Bathon, 1977;Connell, 1981;Shapiro, 1984).…”

Section: Introductionmentioning

confidence: 99%

Controlling fungi that colonize eggs of the western corn rootworm in the laboratory

Oloumi‐Sadeghi

Levine

1989

Entomologia Exp Applicata

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When incubated on filter or blotter paper in the laboratory, eggs of the western corn rootworm, Diabrotica virgifera virgifera LeConte (Coleoptera, Chrysomelidae), were usually colonized and killed by the fungus Cylindrocarpon destructans (Zins.) Scholten. The effects of type of paper used during incubation and boiling, rearing substrate (paper or soil), pH, and antimicrobial chemicals on percent egg hatch and fungal colonization were evaluated. Neither paper type nor boiling the paper affected hatch or fungal colonization. Significantly (P < 0.05) higher numbers of eggs hatched and fungi colonized lower numbers of eggs when eggs were incubated on the soil surface than when they were incubated on filter paper. In treatments where eggs were placed within soil, the longer the eggs remained in the soil, the greater the percent egg hatch and the lower the incidence of fungal colonization. Egg hatch was significantly lower and fungal colonization significantly higher at pH 3 than at pH 4 through 8 and distilled water. Treatment of eggs with benomyl significantly reduced fungal colonization and increased hatch while not affecting the number of days required for initial, 50%, and last hatch of eggs or larval survival. Résumé Contrôle des champignons qui colonisent au laboratoire les œufs de Diabrotica virgifera virgifera Les œufs de D. virgifera virgifera sont généralement colonisés par un ensemble d'espèces de champignon, lors de leur incubation au laboratoire sur papier filtre ou papier buvard. Cylindrocarpon destructans (Zins.) Schölten prédomine parmi les espèces identifiées: plus de 95% des cas observés. La colonisation par des champignons réduit souvent considérablement le taux d'éclosion. L'influence du type de papier, de l'ébullition préalable, du substrat (papier ou sol), du pH, et de fongicides chimiques a été examinée. Ni le type de papier, ni son ébullition préalable ne modifient les taux d'éclosion et de contamination par les champignons. Lors de l'incubation à la surface du sol, le taux d'éclosion est significativement plus élevé et le nombre d'œufs contaminés significativement plus faible (P < 0.05) que sur papier filtre. Lorsque les œufs sont placés dans le sol, plus le temps de séjour est long, plus le taux d'éclosion est élevé et plus la colonisation par les champignons est faible. Le taux d'éclosion est significativement plus bas à pH 3 qu'aux pH de 4 à 8 et dans l'eau distillée. Les traitements des œufs au bénomyl et au thiram réduisent significativement les taux de contamination fongique par rapport au témoin (eau distillée). Les taux de contamination après traitement avec d'autres fongicides sont les mêmes que celui du témoin; par contre, les taux d'éclosion après traitement au bénomyl, au formaldéhyde, à l'eau de Javel, ou à l'éthanol sont significativement supérieurs à ceux des témoins. Le thiram élimine presque totalement la moisissure (0.5% de colonisation), mais tue presque tous les œufs (95.3%). L'effet fongique de bénomyl ne difière pas significativement de celui du thiram. Le nombr...

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“…The number of days to initial and 50% egg hatch at each of the five temperatures is given in Table I. Using the method of Apple et al (1971), the threshold temperature for egg development was 9.7"C. This temperature is very close to the 9.5"C reported by Pate1 and Apple (1967) for a Wisconsin population of northern corn rootworm, but is at variance with Chiang and Sissons' (1968) finding of 11.5"C for a Minnesota population.…”

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confidence: 99%

THRESHOLD TEMPERATURE AND THERMAL CONSTANT FOR EGG DEVELOPMENT OF NORTHERN CORN ROOTWORM, DIABROTICA LONGICORNIS (COLEOPTERA: CHRYSOMELIDAE)

Carval

Yule

1983

Can Entomol

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The northern corn rootworm, Diabrotica longicornis (Say), is a recent pest of corn in southern Québec (Guibord 1976). Little is known of local quantitative temperature relationships, although such information could have important practical applications in developing a pest management program.The object of this study was to determine the threshold temperature and thermal constant for egg development and eclosion, and to relate soil and air temperatures to the phenology of egg hatch in the field under Qutbec corn-growing conditions.

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Thermal Requirements for Northern Corn Rootworm Egg Hatch12

Cited by 9 publications

References 0 publications

Inheritance of an extended diapause trait in theNorthern corn rootworm,Diabrotica barberi(Coleoptera:Chrysomelidae)

Inheritance of an extended diapause trait in theNorthern corn rootworm,Diabrotica barberi(Coleoptera:Chrysomelidae)

Controlling fungi that colonize eggs of the western corn rootworm in the laboratory

THRESHOLD TEMPERATURE AND THERMAL CONSTANT FOR EGG DEVELOPMENT OF NORTHERN CORN ROOTWORM, DIABROTICA LONGICORNIS (COLEOPTERA: CHRYSOMELIDAE)

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