The common red spider or two-spotted mite, Tetranychus telarius L., has only recently become a major pest of deciduous fruit trees. This has happened in many parts of the world and appears to be associated with the use of DDT as a cover spray. DDT not only failed to control red spider, but actually increased the incidence of the mites by destroying insects that preyed upon them, thus upsetting the hitherto almost perfect natural control of the mites.
Vatellinae Diagnostic characters: Eyes large and prominent; outline of pronotum and elytra discontinuous; scutellum hidden and upper surface densely punctured. Prosternal process set at an angle to the prosternum and its termination bent in a dorsal direction, ending in front of the contiguous mesocoxae. No metasternal process between the mesocoxae; metepisterna not reaching the mesocoxal cavities. Metacoxal processes short, barely covering the base of the trochanters.
In the annual report of the South African Institute for Medical Research for the year 1956 (Johannesburg, 1957, p. 61), it was announced that the Department of Entomology, in collaboration with other institutes, was preparing a check-list of arthropods parasitizing vertebrates in Africa south of the Sahara. During the compilation of this list several questions have arisen concerning the systematics and synonymy of the mesostigmatic mites. The various problems encountered are discussed in the present paper.
Herr Dr. F. Zumpt, Johannesburg, Sï¿½dafrika, sandte mir eine Anzahl von Exemplaren einer Milbe, die von Herren des ""Institute for Medical Research"" am 14.3.1953 in Makapans Cave, einer Hï¿½hle bei Potgietersrust in Transvaal, gesammelt worden waren. Es ist eine neue Art, welche zu den Uropodina Kramer 1881 gehï¿½rt.
The cowpea is an important green manuring and leguminous hay crop in summer rainfall areas of the Union. In native areas and on the Gold Mines its seed constitutes an essential part of the diet of natives. This crop is subject to attack by a wide range of insect pests, and in some localities cowpea seed production is uneconomical because of seedï¿½ infesting insects. This article embodies the results of a survey conducted of insects injurious to cow peas in the locality of Pietermaritzburg. The majority of the insects recorded are widely distributed in the Natal Region.
Thanks to the courtesy of Mr. D. P. Annecke (Parasite Laboratory, Division of Entomology, Pretoria) we have had the opportunity of examining 7 male specimens of Strepsiptera taken at Pretoria. Of the three species represented, two appear to be new: one of the genera, hitherto known only from the holarctic regions, is now recorded from Africa for the first time.
Pyrellia natalensis n.sp. Male: Length 7.5-8.8 mm. Buccae, parafacialia and parafrontalia below the narrowest point of the frons, densely white pollinose except for a small black area at the ends of the ptilinal suture; upper part of the parafrontalia black; antennae and palpi black; proboscis with mentum black with metallic reflections. Head: profile of normal shape, lower margin not straight as in P. stuckenbergi
In 1952, I proposed the genus Phytoseiulus for the reception of Phytoseiulus speyeri Evans (= Laelaps macropilis Banks, 1906), a phytoseiid mite associated with tetranychids on tomato plants in the Canary Islands. As in other species of the family, P. speyeri lacks the full complement of setae on the dorsum. The genus was characterised by the chaetotactic pattern of the dorsal shield and the form of the shield surrounding the anus in the female. Recently, Athias-Henriot (1957) has added a second species to the genus, Phytoseiulus persimilis.
The rhinoceros beetles Oryctes boas (F.) and O. monoceros (Oliv.) do serious damage to coconut palms in Zanzibar and East Africa. These beetles breed in decaying wood, particularly decaying palm trunks, and in manure and compost heaps. They lay their eggs in the decaying vegetable matter, often boring well inside to do so. The eggs, white and the size of mustard seeds, hatch in 7 to 9 days. The larvae take between one hundred and two hundred days to reach maturity according to temperature and availability of food; and the pupal stage lasts from 14 to 21 days.
The green peach aphid, Myzus persicae (Sulzer), is known as an injurious insect on many plants from most parts of South Africa. Additionally, its presence in potato fields where heavy leaf roll and virus Y infections occur, leads one to believe that it plays an important part in the spread of virus infections. In spite of the great economic importance of this species its biology under South African conditions has not yet been studied. A program of research on its biology and ecology, with special emphasis on its importance as a vector of potato virus diseases, was therefore started in 1956.
Chirothrips capensis n.sp. (Figs. 1-8). Summary of characters: A dark species of intermediate to large size, in female without any prolongation of the head, in male with a short prolongation between fore margin of eyes and bases of antennae, second antennal segment not at all produced at outer margin in both sexes, sense-cones on antennal segments III and IV simple, in female with interocellar setae often laterad of the fore ocellus, in male with small, circular areae porosae on sternites III to V. Female macropterous, male brachypterous.
Sericothrips formosus spec. nov. (Figs. 1-4, 14, 15). Female (macropterous) . Length ( distended) 1.1-1.2 mm. Colour variegated, brown to black, grey and yellow: pronotum and abdominal segments v and vi largely yellow; head: dorsal aspect between eyes and ocelli, and as far caudad as occipital line, yellowish brown to light brown, yellow behind occipital line, which is usually not as dark behind ocelli as it is behind eyes; laterally the area below each eye greyish yellow, but tinged with brown along eye and in anterior part, with the occipital line well-marked, brown;
The data set forth in this paper have been collected by the writer during investigations occupying four years. The Tettigoniid investigated was first descriptionbed by Pï¿½ringuey in 1916. It is very common during the late summer, autumn and early winter months on low thorn trees and scrub on the outskirts of Kimberley. According to Pï¿½ringuey (op. cit) its distribution is restricted to the Great Karoo and North-western areas of the Cape Province.