Crusty Leaf Spot Disease of Mango

A crusty spot disease on mango leaves was found to be ubiquitous on neglected mango trees throughout Peninsular Malaysia. Light and scanning electron microscope studies revealed the crusty structures to be the ascostromata of the fungus, Zimmennaniella trispora. This disease can cause severe leaf spotting of trees. This is the first report of z. trispora as a leaf parasite of mango in Malaysia

Field Evaluation of Four Insecticides for the Control of the Mango Leaf-cutting Weevil, Deporaus marginatus Pasco

In an insecticidal trial for the control of the leaf-cutting weevil of mango, Deporaus marginatus Pasc., deltamethrin was the most effective insecticide followed by etrimfos, acephate and dicrotophos in that order. A persistency study of deltamethrin in the field showed that the insecticide was effective for up to two weeks

Ecological studies on Chlenias pachymela Lower (Lepidoptera : Geometridae)

ix, 177 leaves, [12] leaves of plates (some col.) : ill., maps, graphs, tables ; 31 cm.Thesis (Ph.D.) -- University of Adelaide, Dept. of Entomology, 198

Some vascular epiphytes on mango and their control

The vascular epiphytes comprising the ferns, orchids and semi-parasitic mistletoes are a common sight in neglected orchards and bud wood nurseries, and on the branches and trunks of old and un tended mango trees in villages and roadsides. Together with the cryptogamic epiphytes like the mosses, liverworts and lichens, they form a unique ecological community on wild and cultivated trees. They thrive in partially shaded positions, growing in cracks and crevices in the bark and at the fork of the trunk and branches and sometimes extending onto the leaves. Despite their ubiquity, their presence on mango and other cultivated trees has often been dismissed as unimportant, hence the dearth of local information available. Most published information on such epiphytes pertains to their taxonomy and botany. Significant contributions in these aspects of the vascular epiphytes have been rendered by Holttum (1964)' on orchids; Sands (1924) on mistletoes; Holttum (1966) and Johnson (1977) on ferns. The aim of this paper is to assess the occurrence, significance. And the control of such epiphytes in relation to mango cultivation. To aid in identification of the epiphytes a brief botanical description is also included

Preliminary study of resistance in 4 populations of Helopeltis theobromae Miller (Hemiptera: Miridae) to γ − HCH, Propoxur and Dioxacarb.

Four populations of Helopeltis theobromae Miller were investigated in Peninsular Malaysia for the existence of resistance to alpha-HCH, propoxur and dioxacarb by means of time-response assays. The insects were confined on treated filter paper and time to knockdown was recorded to establish lethal exposure time (LT50) and percentage survival. The order of sensitivity of different populations to alpha-HCH was Serdang Bagan Datoh Teluk Intan Intan = Kajang; and to dioxacarb, Serdang Kajang was consistently most sensitive or susceptible to all three insecticides. The Kajang population the only one showing tolerance or resistance, having an LT50 value three times higher than the Serdang population; the survival after 4 hr continuous exposure was 36% for the former and nil for the latter. The existence of differential sensitivity to each of the three insecticides between the four populations indicated an impending resistance problem