Methyl Anthranilate as a Repellent for Western Corn Rootworm Larvae (Coleoptera: Chrysomelidae).

Methyl anthranilate was identified as the active compound in extracts of maize (Zea mays L.) roots that were shown to be repellent to neonate western corn rootworm (Diabrotica virgifera virgifera LeConte) larvae. A bioassay-driven approach was used to isolate the active material from diethyl ether extracts of roots from germinating maize seeds. Separation of the extract on a Florisil column yielded an active fraction of 90:10 hexane:diethyl ether. Analysis with gas chromatography-mass spectrometry identified two compounds in the active fraction: indole (2,3-benzopyrrole) and methyl anthranilate (methyl 2-aminobenzoate). When tested in behavioral bioassays, methyl anthranilate elicited a significant (P < 0.05) repellent response at doses of 1, 10, and 100 µg. In subsequent single-choice bioassays, 1, 10, and 100 µg of methyl anthranilate prevented larvae from approaching 10 mmol/mol concentrations of carbon dioxide, which is normally highly attractive to the larvae. Indole, the other compound identified from the active fraction, did not elicit a behavioral response by the larvae. Methyl anthranilate has potential for development as a management tool for western corn rootworm larvae and may be best suited for use in a push-pull control strategy.

Thyroid orbitopathy possibly predisposes to late-onset of periocular lymphoma.

AIM: The prevalence of thyroid orbitopathy, compared with an estimate for the United Kingdom population, is examined in a large cohort of patients treated for periocular lymphoma. PATIENTS AND METHODS: Clinical details were reviewed for patients presenting to the Orbital Clinic at Moorfields Eye Hospital with biopsy-proven periocular lymphoma. Recorded evidence of prior thyroid gland abnormality or thyroid eye disease was sought and treatment details recorded, together with that of the subsequent periocular lymphoma. The calculated prevalence of thyroid orbitopathy in our patients with periocular lymphoma was compared with an estimate based upon published figures for a United Kingdom population. RESULTS: Of 369 patients with periocular lymphoma, 20 (5%) had a history of thyroid disease and adequate notes were available in 10 cases: All had autoimmune thyrotoxicosis between 11 and 27 years (median 17.5) before diagnosis of periocular lymphoma and 6/10 had thyroid orbitopathy-none receiving orbital radiotherapy for treatment of their thyroid eye disease. Using a calculated estimate for the UK prevalence of thyroid orbitopathy, the probability of even these six cases of ophthalmopathy among 369 patients with periocular lymphoma is very low (P=0.007). CONCLUSION: Compared with a population estimate, patients with periocular lymphoma had a significantly greater prevalence of preceding thyroid orbitopathy, with a median latency of 17 years. Thyroid orbitopathy possibly predisposes to later local lymphoma in a manner similar to the late emergence of lymphoma with other chronic inflammatory diseases-such as Sjögren's syndrome, Hashimoto's thyroiditis, coeliac disease, or Helicobactergastritis.