ChemInform Abstract: 7-Vinyldecyl Acetate (I), a Novel Inhibitor of Pheromonal Attraction in the False Codling Moth, Cryptophlebia leucotreta.

ChemInform ◽  
2010 ◽  
Vol 22 (37) ◽  
pp. no-no
Author(s):  
B. V. BURGER ◽  
M. LE ROUX ◽  
W. M. MACKENROTH ◽  
H. S. C. SPIES ◽  
J. H. HOFMEYR
Keyword(s):  
Codling Moth ◽  
False Codling Moth ◽  
Cryptophlebia Leucotreta

Movement and impact of Trichogrammatoidea cryptophlebiae Nagaraja (Hymenoptera: Trichogrammatidae) in citrus orchards after inundative releases against the false codling moth, Cryptophlebia leucotreta (Meyrick) (Lepidoptera: Tortricidae)

1988 ◽  
Vol 78 (1) ◽  
pp. 85-99 ◽  
Author(s):  
Philip J. Newton
Keyword(s):  
Codling Moth ◽  
Egg Parasitoid ◽  
Linear Increase ◽  
Crop Damage ◽  
Larval Population ◽  
Important Pest ◽  
False Codling Moth ◽  
Pest Density ◽  
Cryptophlebia Leucotreta ◽  
Inundative Releases

AbstractInundative releases of the indigenous egg parasitoid Trichogrammatoidea cryptophlebiae Nagaraja were made against Cryptophlebia leucotreta (Meyrick) in two sweet orange orchards in the Transvaal lowveld, South Africa. The rate of parasitism was raised to similar levels in the two release areas, but there was a significant decrease in crop damage in only one of them. Although the larval population was twice as large in a control orchard, the losses there were compensated for by a larger total crop. Three explanations for the different performances of the parasitoids are examined. Movement away from release areas was not apparent. Rates of parasitism at the tops or bottoms of trees or at the four cardinal aspects were not significantly different overall but should have been to compensate for the linear increase in numbers of host eggs with height, and the larger numbers on the warmer northern and eastern sides of trees. Parasitism was higher at the tree tops than at the bottoms in the orchard that lost the least fruit. The stochastic processes governing host-egg distribution on fruit were also important. Pest density was higher in the release areas than the control, and eggs were distributed more contagiously in the orchard with the most crop loss.

Cryptophlebia leucotreta. [Distribution map].

1976 ◽  
Author(s):  
Keyword(s):  
Sierra Leone ◽  
Ivory Coast ◽  
Host Plants ◽  
Codling Moth ◽  
Distribution Map ◽  
False Codling Moth ◽  
St Helena ◽  
New Distribution ◽  
Cryptophlebia Leucotreta ◽  
Upper Volta

Abstract A new distribution map is provided for Cryptophlebia leucotreta (Meyr.) (Argyroploce leucotreta[Cryptophlebia leucotreta] Meyr.) (Lep., Tortricidae) (False Codling Moth). Host Plants: Citrus, cotton, avocado, castor, maize. Information is given on the geographical distribution in AFRICA, Angola, Burundi, Cameroun, Chad, Dahomey, Ethiopia, Gambia, Ghana, Ivory Coast, Kenya, Madagascar, Malawi, Mali, Mauritius, Mozambique, Niger, Nigeria, Reunion, Rhodesia, Rwanda St. Helena, Senegal, Sierra Leone, Somalia, South Africa, Sudan, Tanzania, Togo, Uganda, Upper Volta, Zaire, Zambia.

Combinations of applications of a chitin synthesis inhibitor and inundative releases of egg parasitoids against the false codling moth, Cryptophlebia leucotreta (Meyrick) (Lepidoptera: Tortricidae), on citrus

1989 ◽  
Vol 79 (3) ◽  
pp. 507-519 ◽  
Author(s):  
Philip J. Newton
Keyword(s):  
Codling Moth ◽  
Significant Degree ◽  
Egg Parasitoid ◽  
Chitin Synthesis ◽  
Synthesis Inhibitor ◽  
Chitin Synthesis Inhibitor ◽  
False Codling Moth ◽  
The Impact ◽  
Cryptophlebia Leucotreta ◽  
Inundative Releases

AbstractA commercial trial of different strategies for suppressing damage by Cryptophlebia leucotreta (Meyrick) to citrus was made in the Transvaal lowveld, South Africa. Different regimes tested were applications of the chitin synthesis inhibitor teflubenzuron at 60 mg a.i./litre and ca 30 litres/tree, inundative releases of the egg parasitoid Trichogrammatoidea cryptophlebiae Nagaraja, and a combination of the two. One objective was to examine whether application of the insecticide earlier in the season than usually recommended would enhance the subsequent impact of parasitoids, native or released. It was found that parasitoid releases throughout the season (1.3 million/ha in total) produced the best overall reduction in damage by C. leucotreta. This was due largely to their better performance than that of any other strategy early in the season. Their impact in the later part of the season was not significantly different from that of release programmes which had begun at a later stage (0·6 million/ha). Very early applications of the teflubenzuron had no apparent impact on crop losses and did not enhance the impact of subsequent parasitoid releases to a significant degree. Teflubenzuron application at a recommended time later in the season was the most successful short-term approach, but its overall impact on crop loss was diminished by damage during the unprotected period before its application. A more appropriate management programme against C. leucotreta might therefore be to combine inundative releases of parasitoids early in the season with later applications of teflubenzuron if economic thresholds show they are required. The two approaches should not be concurrent since parasitoid activity was suppressed by the chitin synthesis inhibitor.

scholarly journals Selection for and Analysis of UV-Resistant Cryptophlebia Leucotreta Granulovirus-SA as a Biopesticide for Thaumatotibia leucotreta

Viruses ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 28
Author(s):  
Patrick Mwanza ◽  
Michael Jukes ◽  
Gill Dealtry ◽  
Michael Lee ◽  
Sean Moore
Keyword(s):  
Uv Irradiation ◽  
Codling Moth ◽  
Probit Analysis ◽  
Uv Exposure ◽  
Thaumatotibia Leucotreta ◽  
Uv Tolerance ◽  
False Codling Moth ◽  
Selection For ◽  
Cryptophlebia Leucotreta

Cryptophlebia leucotreta granulovirus-SA (CrleGV-SA) is used as a commercial biopesticide for the false codling moth, Thaumatotibia leucotreta, in citrus and other crops. The virus is sensitive to UV irradiation from sunlight, which reduces its efficacy as a biopesticide in the field. We selected a UV-resistant CrleGV-SA isolate, with more than a thousand-fold improved virulence compared to the wild-type isolate, measured by comparing LC50 values. CrleGV-SA purified from infected T. leucotreta larvae was exposed to UV irradiation under controlled laboratory conditions in a climate chamber mimicking field conditions. Five cycles of UV exposure, followed by propagating the virus that retained infectivity in vivo with re-exposure to UV, were conducted to isolate and select for UV-resistant virus. Serial dilution bioassays were conducted against neonates after each UV exposure cycle. The concentration-responses of the infectious UV-exposed virus populations were compared by probit analysis with those from previous cycles and from the original CrleGV-SA virus population. NGS sequences of CrleGV-SA samples from UV exposure cycle 1 and cycle 5 were compared with the GenBank CrleGV-SA sequence. Changes in the genomes of infective virus from cycles 1 and 5 generated SNPs thought to be responsible for establishing UV tolerance. Additional SNPs, detected only in the cycle 5 sequence, may enhance UV tolerance and improve the virulence of the UV-tolerant population.

7-Vinyldecyl acetate, novel inhibitor of pheromonal attraction in the false codling moth, cryptophlebia leucotreta

1990 ◽  
Vol 31 (40) ◽  
pp. 5771-5772 ◽  
Author(s):  
B.V. Burger ◽  
M. le Roux ◽  
W.M. Mackenroth ◽  
H.S.C. Spies ◽  
J.H. Hofmeyr
Keyword(s):  
Codling Moth ◽  
False Codling Moth ◽  
Cryptophlebia Leucotreta

Individual Variation in the Sex Pheromone Components of the False Codling Moth, Cryptophlebia leucotreta (Lepidoptera: Tortriciade)

1986 ◽  
Vol 41 (11-12) ◽  
pp. 1077-1081 ◽  
Author(s):  
Athula B. Attygalle ◽  
Jürgen Schwarz ◽  
Otto Vostrowsky
Keyword(s):  
Gas Chromatography ◽  
Codling Moth ◽  
Dorsal Part ◽  
Average Amount ◽  
Individual Variations ◽  
Pheromone Components ◽  
False Codling Moth ◽  
Related Compounds ◽  
Cryptophlebia Leucotreta ◽  
Pheromone Glands

Abstract Analysis of individual pheromone glands of the false codling moth Cryptophlebia leucotreta Meyr. originating from South Africa, was performed by capillary gas chromatography. During the calling period, the pheromones are concentrated in the dorsal part of the intersegmental membrane between the abdominal segments V III and IX . The average amount of pheromones and related compounds present in the gland was 412 ng/♀ . This total amount was highly variable from individual to individual (200-740 ng/♀). However, the relative amounts of (Z)- and (E)-8- dodecenyl acetates showed a narrow variance. The coefficients of variance values of these two components, 10 and 19 respectively, were significantly lower than those of other components present in the gland. The results infer that the different isomer ratios of (Z)- and (.E)-8-dodecenyl acetates reported for C. leucotreta cannot be due to individual variations. Hence, the presence of different geographical strains can be expected.

Sign in / Sign up

Export Citation Format

Share Document