1. Limitations in the effective diagnosis of viruses, viroids and spiroplasma infecting citrus and avocado trees

   • Moshe Bar-Joseph

   Guest Editorial Pages: 275 - 279

2. Inheritance of two body color mutations of the spiny bollworm (Earias insulana)

   • M. Klein
   • N. Umiel

   Research Paper Pages: 281 - 285

3. Effect of Margosan-O on the development ofEarias insulana

   • J. Meisner
   • M. Klein
   • Sara Keren

   Research Paper Pages: 287 - 297

4. Laboratory selection of resistance by the Red Flour Beetle,Tribolium castaneum (Herbst), To a carbon dioxide-enriched atmosphere

   • E. Donahaye

   Research Paper Pages: 299 - 308

5. Arthropod fauna and main insect pests of plane trees in Israel

   • J. Halperin

   Research Paper Pages: 309 - 319

6. In vitro Variability of a number of characteristics ofSclerotinia sclerotiorum

   • J. A. Torés

   Research Paper Pages: 321 - 329

7. Effect of light duration and growth season on verticillium wilt in potato

   • Leah Tsror (Lahkim)
   • L. Livescu
   • A. Nachmias

   Research Paper Pages: 331 - 339

8. Modeling temporal progress of plant diseases

   • Ruth Marcus

   Research Paper Pages: 341 - 351

9. Leaf and stem blight ofEuphorbia geniculata incited byBipolaris zeicola

   • P. Lakshmanan
   • R. Jeyrajan
   • P. Vidhyasekaran

   Note Pages: 353 - 355

10. Correction

    • G. Kritzman
    • Y. Ben-yephet

    Erratum Pages: n2 - n2