The prevalence of substance use disorders and associated characteristics among patients admitted to a psychiatric hospital in Botswana.

OBJECTIVE: Substance use disorders (SUDs) have increased substantially across the globe, and has become one of the world's most significant public health and socioeconomic challenge. This study examined the prevalence and patterns of substance use disorders among patients admitted to the main psychiatric hospital in Botswana, the Sbrana Psychiatric Hospital. METHOD: This was a cross-sectional study of patients admitted to a major psychiatric hospital in Botswana. SUDs were assessed using the Alcohol, Smoking, and Substance Involvement Screening Test (ASSIST) v13.0. Bivariate analysis was conducted to determine the association between socio-demographic characteristics and SUDs. Multivariate logistic regression was used to control for confounders. RESULTS: The final analysis involved 101 patients. Participants ranged in age from 18-60 years, and over half (59.4%) were male. The majority of participants (85.1%) had used potentially addicting substances at least once during their lifetime, with 63.4% having current substance use disorders. The most frequently used substances were tobacco, cannabis, alcohol, and cocaine at 58.4%, 42.6%, 34.7% and 12.8% respectively. SUDs were more common among participants who were male, ages 18-35 years, single, had a tertiary education, or were unemployed. CONCLUSIONS: There is a high prevalence of substance use and SUDs among psychiatric patients in Botswana. Screening for and interventions to manage SUDs should be part of routine care at psychiatric health care facilities in this country. Consideration should be given to the screening of all patients admitted to psychiatric hospitals in Botswana for SUDs using the ASSIST.

The bark beetle, Ips grandicollis, disrupts biological control of the woodwasp, Sirex noctilio, via fungal symbiont interactions.

The corticoid fungus, Amylostereum areolatum, is deposited in pine trees by the woodwasp, Sirex noctilio, at the time of oviposition. This fungus is essential in S. noctilio larval growth and it is also a food source for Beddingia siricidicola, the nematode used for S. noctilio biological control. In recent years, the historically successful biological control programme has been disrupted in Australia by the bark beetle, Ips grandicollis. This study investigated whether the mechanism of this disruption involves a fungus, Ophiostoma ips, which I. grandicollis introduces into trees. In artificial and wood media, A. areolatum was unable to grow in areas occupied by O. ips. The latter fungus was faster growing, especially at 25 °C rather than 20 °C. Larval galleries of S. noctilio in field-collected samples were strongly associated with wood infested by A. areolatum and absent from areas affected by O. ips. The nematode failed to survive and reproduce on O. ips as it can on A. areolatum. Competitive interactions between O. ips and A. areolatum within the trap trees are demonstrated to be key factors in the negative effect of I. grandicollis on S. noctilio biological control programmes.

Tri-trophic insecticidal effects of African plants against cabbage pests.

Botanical insecticides are increasingly attracting research attention as they offer novel modes of action that may provide effective control of pests that have already developed resistance to conventional insecticides. They potentially offer cost-effective pest control to smallholder farmers in developing countries if highly active extracts can be prepared simply from readily available plants. Field cage and open field experiments were conducted to evaluate the insecticidal potential of nine common Ghanaian plants: goat weed, Ageratum conyzoides (Asteraceae), Siam weed, Chromolaena odorata (Asteraceae), Cinderella weed, Synedrella nodiflora (Asteraceae), chili pepper, Capsicum frutescens (Solanaceae), tobacco, Nicotiana tabacum (Solanaceae) cassia, Cassia sophera (Leguminosae), physic nut, Jatropha curcas (Euphorbiaceae), castor oil plant, Ricinus communis (Euphorbiaceae) and basil, Ocimum gratissimum (Lamiaceae). In field cage experiments, simple detergent and water extracts of all botanical treatments gave control of cabbage aphid, Brevicoryne brassicae and diamondback moth, Plutella xylostella, equivalent to the synthetic insecticide Attack® (emamectin benzoate) and superior to water or detergent solution. In open field experiments in the major and minor rainy seasons using a sub-set of plant extracts (A. conyzoides, C. odorata, S. nodiflora, N. tabacum and R. communis), all controlled B. brassicae and P. xylostella more effectively than water control and comparably with or better than Attack®. Botanical and water control treatments were more benign to third trophic level predators than Attack®. Effects cascaded to the first trophic level with all botanical treatments giving cabbage head weights, comparable to Attack® in the minor season. In the major season, R. communis and A conyzoides treatment gave lower head yields than Attack® but the remaining botanicals were equivalent or superior to this synthetic insecticide. Simply-prepared extracts from readily-available Ghanaian plants give beneficial, tri-trophic benefits and merit further research as an inexpensive plant protection strategy for smallholder farmers in West Africa.