FAO Plant Protection Bulletin, Volumes 20-23

adults agents Agric Agriculture Apartado aphid beetle Beirut blight Bookshop breeding Bull cages Caracalla caused chemical chickpea citrus coconut countries cowpea crop culture damage Dawra DISEASES AND PESTS economic effect FAO Plant Prot FAO Plant Protection Figure fruit fungicides fungus grains Hevea host important India infected inoculated insecticides Institute International larvae leaf lethal yellowing Librairie Librería maize Malaya methods mites moth mycoplasma-like nematode Nicolás de Piérola observed occurred outbreak P.O. Box palms parasites pathogen pearl millet percent pest pesticides phosphine phyllody pigeon pea plant diseases plant pathology Plant Protection Bulletin Plant quarantine population potato wart production programme race region resistance rice Rome root disease rust Sales Section samples Santiago seed SERVICE ON PLANT species spray Street studies susceptible symptoms Terazije tion treatment trees tube U.S. Department varieties vector virus viruses wart disease weed wheat World Reporting Service yield