SEASONAL FLUCTUATION OF THE SPINY BOLLWORM, Earias insulana (BOISD.) ON SOME HOST PLANTS

Abstract

The seasonal fluctuation of the spiny bollworm (SBW), Earias insulana (Boisd.), (moths and larvae) was detected on cotton, Gossypium barbadense L., okra, Hibiscus esculentus L. and maize, Zea maize L. at Minia Elkamah district, Sharkia Governorate during 2013 and 2014 seasons. Results revealed that the population of SBW male moths recorded four peaks on cotton and okra each season , the fourth peak appeared the highest numbers on the 2 nd & 3 rd and 3 rd & 4 th weeks of October with 39 & 57 and 45 & 65 moths/trap/week in the two cotton and okra seasons, respectively. While, on maize, the population of moths recorded two peaks with 7&11 and 10&13 moths /trap/ week in first sowing date and one peak with 30 and 40 moths /trap/ week in second sowing date during the two seasons, respectively. The infestation percentage by the SBW larvae was recorded two peaks in cotton at 4 th week and 3 rd week of August and 2 nd and 3 rd weeks of October and three peaks in okra at 4 th and 2 nd week of June, 2 nd week of September and 3 rd week of November; the second peak in cotton (26.0 and 19.0 %) and third peak in okra (33.0 and 37.0 %) were the highest than other during the two seasons, respectively. While, the highest infestation percentage by the SBW larvae which attack maize was recorded in 3 rd week of August with 3.0 and 4.0% and 3 rd week of November with 5.0% in the first and second sowing date during the two seasons, respectively. The infestation by the SBW larvae and the population of SBW male moths captured in sex pheromone traps were highest on okra followed by cotton and maize. The population of SBW moth catches was negatively correlated with mean of temperature and positively correlated with mean of relative humidity in 2013 and 2014 seasons. This study play an important role in determine timing to control of the SBW.

Laboratory Study on Some Potential Histological Changes Induced by the Toxicity of a Mixed Insecticide (spinetoram + methoxyfenozide) on The Spiny Bollworm, Earias insulana

“…Insect Rearing E. insulana, a laboratory strain, was obtained from a colony maintained in the Bollworms Research Department, Plant Protection Research Institute, Agriculture Research Centre. Larvae were reared on an artificial diet as described by Amer (2015) and incubated at 26±1℃. The pest rearing and bioassay tests were carried out under the same conditions.…”

“…The LC50 of the tested compound against E. insulana larvae was estimated by preparing halfway series of six concentrations ranging between 4.5 and 0.14 ppm using tap water. Each concentration was tested by preparing three replicates of glass tubes (2×7 cm) (30 sterile tubes/replicate), each containing approximately 3.0 gm of an artificial diet prepared according to Amer (2015). A drop of 0.2 ml per each prepared concentration was spread on the upper surface of the artificial food's tubular content using a dropper.…”

“…This pest is present on cotton plants at the beginning of the growing season and flower formations. It is highly active from mid to late cotton season (Amer et al, 2015). It feeds on terminal buds and flowers.…”

Effect of Magnetic Power and Radiant Compound on Some Biological and Biochemical Aspects of Earias insulana (Boisduval) (Lep.: Noctuidae )

“…: Noctuidae) is a major insect pest it causes a threat to cotton and is considered as mid-late season pest. The larvae mainly feed on fruiting parts of the cotton plant and okra, the soft and growing tissues especially the terminal buds and cause "top boring" and later on they attack the flower buds and bolls which ultimately shed (Khan, et al 2007, Amer (2015 and Amer, et al 2015), resulting in considerable losses in quantity and quality Gaaboub, et al 2016) Our previous investigations on the role of the magnetic field system in response and adaptation to stressful conditions (physical and chemical stressors) in the insects studied by (Mrd a ković et al 2004). It is well known that a magnetic field effects on some insect orientation, development, behaviour (Prolic et al 2003, Saiyed et al, 2017and Kandil et al, 2018,.…”

Comparative Efficacy of Uphold and Closer Insecticide on the Developmental, Reproductive, Biochimical and Histological of the Spiny Bollworm, Earias insulana (Boisd.)

“…attack the bolls and the flower buds and feed on the growing tissue of top boring for the soft and growing tissues especially the terminal buds (Khan et al, 2007). As a result, it causes economic damage that leads to losses in quantity and quality (Gaaboub, et al, 2016 andAmer, et al, 2015). Some chemical insecticides are applied for pest management (Dinham B., (1993).…”