Effect of Certain Weather Factors and Some Natural Enemies on the Population Density of the Bollworms and Cotton Leafworm at Kafr El-Sheikh Governorate, Egypt

Somaa, Hassan M

doi:10.21608/jppp.2016.50113

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“…While there was a significant negative correlation between C. carnea and E. insulana population in the three planting dates and a highly significant positive correlation between spiders and E. insulana population in the three planting dates during season 2019. In this respect, similar results were obtained by Somaa (2016) and Mesbah et al . (2008) who found significant correlation between predators and spiny bollworm population.…”

Section: Discussionsupporting

confidence: 91%

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Effect of planting dates and recommended insecticides application on Earias insulana (Boisd.) and its associated predators in cotton field in Egypt

Moustafa

2021

Bull. Entomol. Res.

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Cotton crops are an important agricultural product in Egypt. However, the bollworm Earias insulana is a significant pest of cotton. Field experiment was carried out during the 2018 and 2019 seasons at Qaha Experimental Station, Qalyoubia governorate to determine the best dates for sowing cotton crops, to minimize E. insulana infestation and maintain high populations of the predators of spiny bollworm. The latest sowing date had a significantly lower infestation of squares, flowers and green bolls than the other two sowing dates. After spraying the three planting date plots with profenofos, lambda-cyhalothrin and methomyl insecticides, infestation of cotton bolls by spiny bollworm was significantly reduced in treated compared with untreated plots. A significant positive correlation (r = 0.829* and 0.827*) was found between the average temperature and E. insulana infestation of squares and flowers, respectively, for the first planting date and (r = 0.819*) in squares for the second planting date of untreated plots of season 2018. The explained variance percentages of multiple regression analysis showed that the effects of mean temperature and relative humidity (RH) on the third sowing date had a significantly lower infestation of squares, flowers and green bolls by spiny bollworm as compared to the first and second sowing dates. The populations of common natural enemies of E. insulana on cotton plants, i.e., Chrysoperla carnea, Coccinella undecimpunctata and spiders were counted during the two seasons. The correlation between the RH percentage and populations of the three predators was insignificantly positive during the 2018 season, while it was negatively or positively insignificant during the 2019 season. The correlation between the mean temperature and the populations of the three predators was insignificantly negative for C. carnea and positive for spiders during the 2018 season, whereas a positive correlation was found between temperature and C. carnea and spiders and a negative correlation between temperature and C. undecimpunctata during the 2019 season.

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Section: Discussionsupporting

confidence: 91%

“…These results also agreed with those of Hassanein et al . (1995), El-Zanan and Watson (1998) and Somaa (2016). Moreover, Bhatti et al .…”

Section: Discussionmentioning

confidence: 99%

Effect of planting dates and recommended insecticides application on Earias insulana (Boisd.) and its associated predators in cotton field in Egypt

Moustafa

2021

Bull. Entomol. Res.

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show abstract

Effect of Certain Weather Factors and Some Natural Enemies on the Population Density of the Bollworms and Cotton Leafworm at Kafr El-Sheikh Governorate, Egypt

Cited by 1 publication

References 0 publications

Effect of planting dates and recommended insecticides application on Earias insulana (Boisd.) and its associated predators in cotton field in Egypt

Effect of planting dates and recommended insecticides application on Earias insulana (Boisd.) and its associated predators in cotton field in Egypt

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