Introduction. Mango productivity is low in seasonally wet-dry tropical areas where breeding programs require information on factors affecting productivity of mango cultivars. Specifically, our study tested a novel hypothesis that, among Australian- and Florida-bred cultivars, the greater growth of vegetatively vigorous cultivars would contribute to lower levels of fruit production in comparison with less vegetatively vigorous cultivars, in a wet-dry tropical environment. Materials and methods. A field experiment was conducted on trees of the cultivars ‘Kensington Pride’ and ‘Strawberry’, both polyembryonic cultivars, and ‘Haden’, ‘Irwin’ and ‘Tommy Atkins’, all monoembryonic cultivars. Results. Shoot growth was recorded over two years; in both years the polyembryonic cultivars produced more new shoot length than the monoembryonic cultivars; ‘Irwin’ was the least vigorous cultivar in both years. Across cultivars, there was a negative relationship between normalised (by flowering intensity and canopy area) fruit number or yield and vegetative vigour as represented by new shoot length. Conclusion. The results supported the hypothesis that the greater shoot growth of vegetatively vigorous cultivars contributed to lower levels of fruit production in comparison with less vegetatively vigorous cultivars in a tropical environment. This is the first study which demonstrates that the extent of seasonal shoot growth had a fruit production cost for mango.

Public health concern has tended to focus on the dangers of obesity, but there is evidence that undernutrition may also pose a risk to physical and mental well-being, particularly in those who are already ill. Using the General Practice Research Database (see office for Population Censuses and Surveys, 1995), we followed up 10 128 men and women aged 18 years and over who had been diagnosed with cancer or cardiovascular disease to examine whether nutritional status, as indicated by BMI, affected rates of use of health care resources and mortality. In both diagnostic groups, patients with a BMI below 20 kg/m 2 had higher rates of consultation with GP, higher rates of prescription and higher death rates during the follow-up period compared with those with a BMI of 20 – < 25 kg/m 2. In men and women with cardiovascular disease, poor nutritional status was associated with a sharply increased risk of hospital admission. Patients whose BMI was 30 – <40 kg/m 2 also tended to have increased rates of GP consultation and prescription, and if they were under the age of 65 years, they had an increased risk of death. The results of the present study suggest that in men and women with cancer or cardiovascular disease, even minor degrees of undernutrition are associated with a marked increase in morbidity and mortality.