Proceedings of the South & East African combined agricultural, cotton, entomological and mycological conference held at Nairobi, August, 1926

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Monograph

Identifikator:: 1738588467

URN:: urn:nbn:de:zbw-retromon-115043

Document type:: Monograph

Title:: Proceedings of the South & East African combined agricultural, cotton, entomological and mycological conference held at Nairobi, August, 1926

Place of publication:: Nairobi

Publisher:: East African Standard

Year of publication:: 1926

Scope:: VI, 337 Seiten; Ill.

Digitisation:: 2020

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Part IV. Etomology & Mycology

Collection:: Economics Books

PART IV. 1 which almost disappears during the rains, in the dry seasons however, it sometimes multiplies so abundantly as to be able to effect a great amount of good. Three of the other species are at times locally abundant, and two of these appear better able to withstand the wet weather. The remaining ones are all more or less scarce. As a general rule the Psocoptera perhaps thrive better under shade. OrDER Neuroptera. Famiy Hemerobiide (Brown Lace-wings). There are probably four species of this family known to feed on the mealy-bug, but none of them is sufficiently common to be of much importance. Famy Chrysopide (Green Lace-wings). Two species are known, one, Notochrysa antica, Walk? is scarce, but the other, Chrysopa sp., is at times very abundant. It appears to be most common during dry weather and on plantations which are not shaded. Famiwy Coniopterygide. One species is known, but it is scarce and of no importance. OrbER Lepidoptera (Moths). Eublemma costimacula, Saalm, is a common predator on Green Scale (Lecanium africanum), but it is not infrequently found destroying mealy-bug, on which it appears to be increasing in numbers. Its larvae are very voracious, and should it be able to become abundant, this species would account for large quantities of mealy-bugs. There is one other (unnamed) moth of which the larve eat mealy-bug; it is, however, not common. There are also two other moths the larve of which are sometimes found in clusters of mealy- bug, but they appear to be scavengers and not to eat the living bugs. OrpER Coleoptera (Beetles). Faminy Coccinellide (Lady-birds). Sixteen species of these most useful insects have been found feeding on mealy-bug. These are: Dysis 4-lineata, Sicard. Scarce. Chilomenes vicina, Muls. Uncommon. Chilomenes lunata, F. Alesia aurora, Gerst. (These last two are mainly aphis-feeders, but they readily take to mealy-bug, and, particularly C. lunata, are increasingly to be found on this pest.) Alesia posticalis, Frm. Apparently scarce. Chilocorus discoideus, Crotch. Not common. Chilocorus angolensis, Crotch. Abundant and universally distributed over the infected areas. Perhaps the most useful of all the lady-birds. Ezochomus nigromaculatus, Goeze. Commonest on Green Scale, but also fairly frequent on mealy-bug. Hyperaspis senegalensis, Muls. Also on Green Scale, but it is common on mealy-bug provided only that the ant Pheidole punctulata 1s absent. 19

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