Abstract
Cotton aphids, Aphis gossypii glover, are major pest threats to cotton plants, leading to quality and yield loss of cotton. Rapid and accurate evaluation on the occurrence and quantity of cotton aphids can help precision management and treatment of cotton aphids. The occurrence rules of cotton aphids on different leaf positions in cotton seedling stage for two cultivars of cotton were studied. The quantity of cotton aphids in the whole cotton seedlings were predicted based on the single leaf cotton aphid quantity. The correlation analysis results showed that cotton aphids of single leaf were significantly and positively correlated with the infected time, the all leaves of the whole plant, the whole plant contained all leaves and branches. The variance analysis results showed that cotton aphids of single leaf were significant difference with the extension of infected time. Based on different leaf positions, monitoring models were constructed respectively. The modelling set’s determination coefficient of ‘Xinluzao-45’ was greater than 0.8, while ‘Lumainyan-24’ was greater than 0.6. The best monitoring leaf position was the third for ‘Xinluzao-45’, the sixth for ‘Lumianyan-24’. From the data analysis, we can realize that it is feasible to construct a monitoring model based on the occurrence of cotton aphid in one leaf in cotton seedling, and different cotton varieties have different leaf positions. This will greatly reduce the investment of manpower and time.
Highlights
Aphis gossypii glover, a worldwide cotton pest, has different hazard levels and hazard areas at different leaf ages of cotton, resulting in lower height and leaf area of cotton plants, an increasing fall rate and lower yield.manual field surveys are used to determine the occurrence and hazard level of aphids and to provide a basis for decision making in plant protection work
In the cotton seedling stage, cotton aphids are easy to live in the cotton growth point, affecting the growth and development of cotton, and very easy to cause cotton “multiple growth points”, and reproduction rate is fast which a short period of time is very easy to large outbreak, causing serious damage, so it is an important pest control in cotton production
The results of this study showed that during the cotton seedling stage, single leaf aphids were highest in leaf position 6, which was higher than other leaf positions
Summary
A worldwide cotton pest, has different hazard levels and hazard areas at different leaf ages of cotton, resulting in lower height and leaf area of cotton plants, an increasing fall rate and lower yield. Manual field surveys are used to determine the occurrence and hazard level of aphids and to provide a basis for decision making in plant protection work. This method is accurate, but it is labour-intensive and timeconsuming to count whole-plant aphids. The spatial and temporal distribution of information on cotton aphids in cotton fields is not clear, resulting in the current production. Received in revised form: 05 Feb 2021.
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