1. Flower-bud blasting in tulips caused by ethylene

   • W. J. De Munk

   OriginalPaper Pages: 41 - 53

2. Studies on the sterile-male technique as a means of control of Adoxophyes orana (Lepidopt., Tortricidae). 1. Problems of mass rearing (crowding effects)

   • G. W. Ankersmit
   • F. Th. M. van der Meer

   OriginalPaper Pages: 54 - 61

3. Changes in the quantity of ribosomes in healthy and virus-diseased plants during senescence

   • J. H. Venekamp
   • V. Taborsky

   OriginalPaper Pages: 62 - 69

4. Book review

   • H. Hoestra

   BookReview Pages: 69 - 69

5. Differences in disc gel electrophorese pattern of soluble proteins excreted by different physiological races and isolates of Cladosporium fulvum

   • A. Van Dijkman
   • S. J. Dieleman
   • A. Kaars Sijpesteijn

   OriginalPaper Pages: 70 - 80

6. Book review

   • G. W. Ankersmit

   BookReview Pages: 80 - 80

7. The spread of carnation mottle virus in carnations in glass-houses

   • R. Zandvoort

   Short Communication Pages: 81 - 84

8. Book review

   • G. J. Bollen

   BookReview Pages: 84 - 84