In the maize-growing belt of Zambia the larva of a galerucid beetle, Buphonella murina Gerst., has become an increasingly important pest of seedling maize, causing South Africa serious reduction in yields. It is a pest that appears to be confined to Central Africa.
In 1947, J. A. Travassos Santos Dias descriptionbed a new species of Amblyomma which he based on a single male collected off a bovine in the municipal abattoir of Magude, Mozambique. He named it Amblyomma theileri in honour of Dr Gertrud Theiler, the well-known tick expert of Onderstepoort. According to the rules of nomenclature, the specific name must bear a feminine ending, and consequently, Santos Dias (1962) corrected the name of the tick to Amblyomma theilerae.
During April 1961 at Amani, Tanzania, Dr H. E. Paterson collected specimens of a species of Aethiopomyia Malloch thought to be closely related to A. gigas (Stein). They are descriptionbed here as a new species with comments on other allied species.
Chelonus (Microchelonus) curvimaculatus Cameron parasitizes potato tuber moth in South Africa. It is widely distributed and occurs commonly in potato fields throughout the country. An account is given of its biology.
Field studies in the eastern Transvaal and Swaziland citrus areas showed that population fluctuations of the citrus psylla, Trioza erytreae (Del Guercio) are correlated with the flushing rhythm of its citrus host. The prolonged flushing of trees in the cooler, moister upland areas which have a high incidence of the greening disease, was found to be more favourable to T. erytreae than the shorter, well-defined flush cycles which characterize the arid, lowland areas where greening is absent or uncommon. There were 6-7 distinct field generations per annum, the synchrony of emergent adults with growth cycles being of importance to the population.
Field studies in the eastern Transvaal and Swaziland indicated that parasites are an important limiting factor to populations of Trioza erytreae (Del Guercio), the South African citrus psylla. The degree of parasitism achieved on this extremely fecund psyllid was variable and depended largely on the presence of a favourable synchrony between the two main parasites and the host. During periods of favourable synchrony at least 40-50% of the susceptible stages were found to be parasitized. Under conditions of poor synchrony, however, parasitism frequently dropped below 10%. Parasite activity was relatively unaffected by regular applications of insecticides.
Glossina pallidipes Aust. occurs in Rhodesia throughout the year but its puparia were available for collection only from about May to December during 1965 and 1966, with really large numbers of puparia being found from August to November. Despite the seasonal differences, puparial collections made during this period, and the records derived from them have provided a substantial amount of new information regarding the parasites of G. pallidipes puparia.
Previous studies, which tend to be rather limited, show considerable variation in estimates of insect parasites of puparia of Glossina. Past workers expressed their results in percentages; but different methods were used by each individual to derive these values.