A field experiment to determine host specificity of Larinus curtus Hochhut (Col., Curculionidae) and Urophora sirunaseva Hg. (Dipt., Tephritidae), candidates for the biological control of Centaurea solstitialis L. (Asteraceae), and Larinus minutus Gyllenhal, a candidate for biological control of C. maculosa Lam. and C. diffusa Lam.

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