African Entomology - Volume 20, Issue 1, 2012
Volumes & issues
Volume 20, Issue 1, 2012
Susceptibility of 12 smoke-dried fish species to Dermestes frischii Kugelann, 1792 (Coleoptera: Dermestidae)Source: African Entomology 20, pp 171 –176 (2012)More Less
A comparative study was undertaken to determine progeny development of Dermestes frischii Kugelann and its damage on 12 smoke-dried fish species. The highest weight of the emerged F1 adult D. frischii was observed in Mormyrus delicosus (0.10 g) followed by Clarias sp. and Malapterurus sp. (0.07 g); while Channa sp., Auchenoglanis sp. and Mormyrus rumi had the least weight of emerged adults (0.01 g). Clarias sp. and Mormyrus delicosus had significantly (P < 0.05) higher number of emerged F1 adults compared with the number of emerged adults in other species except Malapterurus sp. and Lates niloticus. The significantly (P < 0.05) longest day to first adult emergence (24 days) was observed in Lates niloticus. The least percentage weight loss (20.52%) due to D. frischii infestation was observed on Channa sp., which was significantly (P <0.05) lower than 73.68% observed in Malapterurus sp. and 71.23% observed in Alestes sp. There was a positive correlation between adult progeny and weight of emerged adult (r=0.92, P<0.01). Also, fish bone weight was positively correlated to percentage weight loss (r = 0.87, P < 0.01).
Protection of upland rice at Lake Alaotra (Madagascar) from black beetle damage (Heteronychus plebejus) (Coleoptera : Dynastidae) by seed dressing : short communicationsSource: African Entomology 20, pp 177 –181 (2012)More Less
In Madagascar, growing demand for rice and resulting increased pressure on inundated lands has favoured the cultivation of upland rain-fed rice on hill slopes. Due to the instability of the ecosystem, this type of agriculture cannot meet the objectives of both sustainability and high yields if conventional tillage is used, particularly due to high erosion risk. Direct seeding, mulch-based cropping (DMC) systems have opened new prospects for upland rice.
Availability and location of cocooning sites for diapausing codling moth larvae (Cydia pomonella (L.)) (Lepidoptera: Tortricidae) on mature and young apple trees : short communicationsSource: African Entomology 20, pp 182 –186 (2012)More Less
Mature larvae of the codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), a key pest of apples and pears, leave infested fruit and spin cocoons in which they transform to pupae. These larvae may either immediately transform to pupae from which moths emerge two to three weeks later, or they overwinter in a state of diapause (Headlee 1929; Steiner 1929; Cutright 1937; Gould & Geissler 1941; Yothers & Carlson 1941; MacLellan 1960; Geier 1963; Wearing & Skilling 1975a,b; Howell 1994; Lacey et al. 2006).
Development of a peroral, droplet-dose bioassay laboratory technique and its application on a granulovirus for Thaumatotibia leucotreta (Lepidoptera : Tortricidae) : short communicationsSource: African Entomology 20, pp 187 –190 (2012)More Less
The false codling moth, Thaumatotibia (= Cryptophlebia)leucotreta Meyrick (1912) (Lepidoptera: Tortricidae) is regarded as a serious pest on citrus and other crops in Africa south of the Sahara (Newton 1998). Biological pesticides have been formulated using entomopathogenic viruses such as granuloviruses (Baculoviridae) (Hunter-Fujita et al. 1998). The efficacy of registered biological control formulations using naturally-occurring South African Cryptophlebia leucotreta granulovirus (CrleGV-SA) needs to be determined as close to field conditions as possible.
The presence of Wolbachia in Tuta absoluta (Lepidoptera: Gelechiidae) populations from coastal Croatia and Montenegro : short communicationsSource: African Entomology 20, pp 191 –194 (2012)More Less
The tomato moth, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae), is a devastating pest of cultivated tomato ( Lycopersicum esculentum Mill.), originating from South America (EPPO 2005). The first occurrence of T. absoluta in Croatia was in December 2009 (Gotlin Čuljak et al. 2010) when lepidopteran larvae were found on a tomato crop in a greenhouse located at Turanj (43°58'N 15°25'E).
First report of Classeya tenuistriga (Hampson) (Lepidoptera: Crambidae) as a pest of maize seedlings : short communicationsAuthor A. ErasmusSource: African Entomology 20, pp 195 –197 (2012)More Less
Reports of localized outbreaks of an unknown pest of maize were received in the Kamberg, Mooi River area in KwaZulu-Natal (29°19.394'S 29°47.310'E) during the 2008/2009 growing season. Damage of a similar nature was again reported during the 2009/10 season. Since farmers reported serious damage to maize seedlings, the matter was investigated and the species identified as Classeya tenuistriga (Hampson) (Lepidoptera: Crambidae) (Fig. 1).
Confirming the pest status of Trimen's false tiger, Agoma trimenii (Felder) (Lepidoptera: Agaristidae), on grapevines in South Africa : short communicationsSource: African Entomology 20, pp 198 –200 (2012)More Less
Various lepidopteran pests attack grapevines in South Africa, but they are mostly regarded as sporadic pests that seldom cause economic damage. The leaf-feeding silver-striped hawk moth, Hippotion celerio (Linneaus) (Sphingidae), is common in the Western Cape Province and occasionally causes economic damage to young vines. Theretra capensis (Linneaus) (Sphingidae) (grapevine hawk moth) and Heraclia superba (Butler) (Agaristidae) (superb false tiger) have also been reported on vines, but are rarely of economic importance (Annecke & Moran, 1982).
The effect of previous feeding on water hyacinth leaf acceptability by three water hyacinth biological control agents measured with a simple Y-tube olfactometer : short communicationsAuthor P. WeylSource: African Entomology 20, pp 201 –205 (2012)More Less
The odours released by a plant under herbivory pressure are intercepted by other herbivorous insects and can elicit behavioural changes. The relevant information relayed to the herbivorous insect may include the nutritional quality of the plant, the presence of potential competitors and natural enemies (Dicke 2000; Dicke & van Loon 2000). It may be expected that with this information, a herbivorous insect may be attracted to or repelled by a particular host plant, depending on the apparent costs and benefits associated with that plant (Dicke & van Loon 2000).