Behavioural ecology of the african armyworm, Spodoptera exempta (Walker): Observations on population processes during a high-density outbreak

1981 ◽  
Vol 1 (02) ◽  
pp. 143-146 ◽  
Author(s):  
Syed Khasimuddin
Keyword(s):  
High Density ◽  
Spodoptera Exempta ◽  
Behavioural Ecology ◽  
African Armyworm ◽  
Population Processes

Modelling the control of African Armyworm (Spodoptera exempta) infestations in cereal crops by deploying naturally beneficial insects

2015 ◽  
Vol 129 ◽  
pp. 268-276 ◽  
Author(s):  
Fina Faithpraise ◽  
Joseph Idung ◽  
Chris Chatwin ◽  
Rupert Young ◽  
Philip Birch
Keyword(s):  
Spodoptera Exempta ◽  
Cereal Crops ◽  
African Armyworm ◽  
Beneficial Insects

African Armyworm, Spodoptera exempta (Walker) (Lepidoptera: Noctuidae)

2008 ◽  
pp. 53-59
Author(s):  
George Hangay ◽  
Severiano F. Gayubo ◽  
Marjorie A. Hoy ◽  
Marta Goula ◽  
Allen Sanborn ◽  
...  
Keyword(s):  
Spodoptera Exempta ◽  
African Armyworm ◽  
Lepidoptera Noctuidae

Forecasting the severity of seasonal outbreaks of African armyworm, Spodoptera exempta (Lepidoptera: Noctuidae) in kenya from the previous year's rainfall

1996 ◽  
Vol 86 (2) ◽  
pp. 129-136 ◽  
Author(s):  
M.J. Haggis
Keyword(s):  
Spodoptera Exempta ◽  
African Armyworm ◽  
South Eastern ◽  
Coastal Belt ◽  
Source Populations ◽  
Lepidoptera Noctuidae

AbstractRainfall records for 23 years at 21 selected stations in Kenya were summarized and compared with the numbers of outbreaks of armyworm Spodoptera exempta (Walker) reported in the following season. The numbers of outbreaks were found to be negatively correlated with the rainfall of the 6–8 months preceding the start of the season. Stations in south-eastern Kenya, including the coastal belt which harbours the most extensive off-season source populations of S. exempta, were identified as key stations for forecasting whether to anticipate local or countrywide armyworm outbreaks next season. A scheme is suggested that would enable a provisional forecast to be made as soon as the long rains (April–May) rainfall records were available, and confirmed or revised subsequently in the light of the June–October rainfall at stations in south-eastern Kenya.

The significance of low-density populations of the African armyworm Spodoptera exempta (Walk.)

1979 ◽  
Vol 287 (1022) ◽  
pp. 393-402 ◽  
Keyword(s):  
South Africa ◽  
Spodoptera Exempta ◽  
Low Density ◽  
African Armyworm ◽  
Weather Patterns ◽  
Solitary Phase

Mass emergences of moths from conspicuous gregarious-phase caterpillars in high densities are important sources of migrant moths, which are borne downwind to cause a progression of armyworm outbreaks northwards from Tanzania to Ethiopia, and southwards from Rhodesia to South Africa. This progression might possibly be checked by destroying outbreak caterpillars. The sources of moths which cause the first outbreaks before the progression starts are not known, and the possibility is examined that these come from scattered populations of solitary-phase caterpillars hidden at the bases of green grasses, where they are sometimes found at considerable density. Recent analyses of weather patterns on the estimated dates of arrival of the moths responsible for fourteen groups of outbreaks in Rhodesia suggest that outbreaks could often be caused by convergent windflow concentratin glow-density moth populations from sources between Rhodesia and the Mozambique coast, and that these sources may persist for several months. A model is presented which attempts to relate the phase forms found in the field with the life system of the armyworm .

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