Trichogramma cacoeciae as a biological control agent of the tomato pinworm Tuta absoluta in Northeastern Tunisia

Asma Cherif; Lebdi Grissa Kaouthar

doi:10.12681/eh.11527

Trichogramma cacoeciae as a biological control agent of the tomato pinworm Tuta absoluta in Northeastern Tunisia

ENTOMOLOGIA HELLENICA ◽

10.12681/eh.11527 ◽

2017 ◽

Vol 22 (2) ◽

pp. 35 ◽

Cited By ~ 4

Author(s):

Asma Cherif ◽

Lebdi Grissa Kaouthar

Keyword(s):

Biological Control ◽

Biological Control Agent ◽

Control Agent ◽

Tuta Absoluta ◽

Trichogramma Cacoeciae ◽

Promising Agent ◽

The World ◽

Northeastern Tunisia ◽

Eggs And Larvae ◽

Tomato Pinworm

Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) is considered as key pest attacking tomato in Tunisia and in many other countries around the world. In order to investigate the efficacy of Trichogramma cacoeciae (Marchal) (Hymenoptera: Trichogrammatidae) for biological control of this pest in Northeastern Tunisia, releases were performed in open field conditions. T. cacoeciae showed a good efficacy on reducing the number of T. absoluta eggs and larvae when releasing 30 adults/plant in plots covered with insect-proof netting in May 2012. The results showed that this parasitoid may be a promising agent for T. absoluta biological control in Tunisia.

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MELANIZATION OF EGGS AND LARVAE OF THE PARASITOID, EPIDINOCARSIS LOPEZI (DE SANTIS) (HYMENOPTERA: ENCYRTIDAE), BY THE CASSAVA MEALYBUG, PHENACOCCUS MANIHOTI MATILE-FERRERO (HOMOPTERA: PSEUDOCOCCIDAE)

The Canadian Entomologist ◽

10.4039/ent12063-1 ◽

1988 ◽

Vol 120 (1) ◽

pp. 63-71 ◽

Cited By ~ 12

Author(s):

Daniel J. Sullivan ◽

Peter Neuenschwander

Keyword(s):

Biological Control ◽

Biological Control Agent ◽

Control Agent ◽

Phenacoccus Manihoti ◽

Defense Reaction ◽

Epidinocarsis Lopezi ◽

Cassava Mealybug ◽

Major Pest ◽

Eggs And Larvae ◽

Host Tissues

AbstractThe encyrtid wasp Epidinocarsis lopezi (De Santis) has been introduced into Africa as a biological control agent against the cassava mealybug Phenacoccus manihoti Matile-Ferrero. This host has a defense reaction against the immature parasitoid that involves encapsulation and melanization. Under laboratory conditions, 37.5% of once-stung cassava mealybugs had been parasitized, as indicated by eggs and larvae of the parasitoid in dissected hosts. Of these parasitized cassava mealybugs, 89.6% contained melanized particles (egg, partially melanized larva, internal host tissues, exoskeleton wound scars). Some of the parasitoid larvae were only partially melanized, and either freed themselves from the melanized capsule or else shed it at the next molt. By the 3rd day of their development only 12.5% were completely melanized. In cassava mealybugs with melanized host tissue but no living parasitoid, the survival of the host was not affected by the melanization. The mealybug itself sometimes shed black particles at the next molt and these were found attached to the cast skins. When superparasitized in the laboratory, 68.6% of twice-stung cassava mealybugs contained parasitoids. Mummies collected from a field experiment showed that melanization rates of mummies increased with increasing parasitization rates. Thus, melanization in the cassava mealybug was commonly triggered when E. lopezi oviposited, but this defense reaction was mostly ineffective, permitting the introduced parasitoid to be a successful biological control agent in Africa against the cassava mealybug, a major pest on this important food crop.

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The leafminer Liriomyza trifolii (Diptera: Agromyzidae) encapsulates its koinobiont parasitoid Halticoptera circulus (Hymenoptera: Pteromalidae): implications for biological control

Bulletin of Entomological Research ◽

10.1017/s0007485315000930 ◽

2015 ◽

Vol 106 (3) ◽

pp. 322-327 ◽

Cited By ~ 3

Author(s):

T. Kemmochi ◽

S. Fujimori ◽

T. Saito

Keyword(s):

Biological Control ◽

Developmental Stages ◽

Biological Control Agent ◽

Control Agent ◽

Liriomyza Trifolii ◽

Parasitism Rates ◽

Significant Difference ◽

Eggs And Larvae ◽

Good Agent

AbstractThe koinobiont parasitoid Halticoptera circulus (Walker) is a potential biological control agent of leafminers, but it has only rarely been collected from the invasive leafminer, Liriomyza trifolii (Burgess), in Japan. To understand why this is the case, parasitism and development of H. circulus in L. trifolii was compared with parasitism and development in two indigenous leafminer species, Liriomyza chinensis Kato and Chromatomyia horticola (Goureau). There was no significant difference in parasitism rates by H. circulus in the three leafminer species and the eggs and larvae successfully developed in L. chinensis and C. horticola. However, H. circulus failed to develop in L. trifolii, where developmental stages were encapsulated by host haemocytes. This parasitoid may be a good agent to control indigenous leafminers such as L. chinensis and C. horticola but is unlikely to be useful for the biological control of the invasive L. trifolii in Japan.

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Comparison of the toxicity and repellency of two conventional neonicotinoids and a coconut-derived insecticide soap toward the parasitoid wasp Aphelinus mali Haldeman, 1851

Acta agriculturae Slovenica ◽

10.14720/aas.2020.115.1.1370 ◽

2020 ◽

Vol 115 (1) ◽

pp. 97

Author(s):

Asgar EBADOLLAHI ◽

Reza SADEGHI

Keyword(s):

Biological Control ◽

Exposure Time ◽

Biological Control Agent ◽

Parasitoid Wasp ◽

Control Agent ◽

Eriosoma Lanigerum ◽

Woolly Apple Aphid ◽

Aphelinus Mali ◽

The World ◽

Filter Papers

The parasitoid wasp Aphelinus mali,Haldeman, 1851 (Hymenoptera: Aphelinidae) is the most important biological control agent against the woolly apple aphid, Eriosoma lanigerum (Hausemann, 1802) (Hemiptera: Aphididae), which is an important apple orchards pest throughout the world. Based on the importance of using low-risk compounds to protect beneficial agents, the present study was carried out to evaluate the toxic and repellent effects of two conventional chemicals (imidacloprid and thiacloprid) and coconut-derived biopesticide soap (PalizinÒ) toward A. mali. The results of residual bioassays on apple leaf discs indicated that imidacloprid after 24 h and insecticide soap after 72 h exposure time categorized at the highest and no/little toxicity rates, respectively. Ingestion bioassays on filter papers revealed that imidacloprid and thiacloprid had moderate toxicity rate, while insecticide soap had a low-level toxicity rate. Repellency test at Y-tube olfactometer showed that the repellent effects of both chemicals were more than that of insecticide soap. It is concluded that coconut-derived soap was compatible with the parasitoid activity, and the caution should be paid when including the two neonicotinoid insecticides imidacloprid and thiacloprid for E. lanigerum management.

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