Incidence Of Sucking Pests Research Articles

Effect of Weed Growth on the Incidence of Sucking Pests in Cucumber

Field experiments were conducted in Fayoum Governorate to evaluate the impact of weeds growing in cucumber fields on the incidence of sucking pests viz., Aphis gossypii (Glover), Bemisia tabaci (Gennadius), Nezara viridula (L.), Phenacoccus solenopsis (Tinsley), Thrips tabaci (Lindeman), Myzus persicae (Sulzer), Empoasca decedens (Paoli) and Empoasca decipiens (Paoli) during 2018 and 2019 Neglected cucumber fields, with a high density of weeds, were observed to harbour more pests 57.7 and 55.9%, respectively. Meanwhile, the cucumber free-weedy field hosted the lowest rate of occurrence for all insect pests represented by 42.3 and 44.1%, respectively. Neglected fields with abundant weeds provide a favourable habitat, leading to increased incidence. Understanding the relationship between weeds and pests is crucial for developing effective IPM strategies in cucumber.

Study on the Incidence of Sucking Pests and Pink Bollworm in Cotton

Sucking pests and pink bollworm are serious pest of cotton one after the other in India by causing serious yield losess. The present investigation was carried out in three major cotton growing mandals of NTR district to understand the level of pest incidence in Bt cotton during Kharif, 2022-23 on regular interval. Among the sucking pests only thrips population recorded 32.26 no/3 leaves and crossed the ETL at 45 DAS. Remaining sucking pests such as Leafhopper, whitefly and aphid did not crossed ETL during crop growth period and highest incidence of 5.92, 4.04 and 27.14 no/3 leaves was recorded respectively at 45, 60 and 120 DAS. Whereas pink bollworm recorded 23.10% rosette flowers, 44.04% boll damage in Bheemavaram village of Vastavai mandal and 40.83% locule damage in Konakanchi village of Penuganchiprolu mandal.

Effect of Dates of Transplanting on Incidence of Sucking Pests in Chilli, Capsicum annum L.

Effect of Dates of Transplanting on Incidence of Sucking Pests in Chilli, Capsicum annum L.

Seasonal incidence of sucking pests and natural enemies in okra

A study was conducted on the seasonal incidence of major sucking pests of okra and their natural enemies during spring-summer season of 2011 and 2012 at the District Seed Farm (AB Block) of Bidhan Chandra Krishi Viswavidhyalaya located at Kalyani, Nadia District, West Bengal. The results revealed that the leafhoppers first appeared in 2nd week of February (0.20−13 leaves) and reached a peak in the 3rd week of July (83.60 and 95.40−13 leaves in 2011 and 2012, respectively). Thereafter, the incidence reduced till the end of the cropping season. Aphids were observed in the first week but then showed a rise and fall with a peak during 1st week of July and 3rd week of June in 2011 and 2012, respectively. Incidence of whiteflies commenced from last week of January (0.07−13 leaves) and 1st week of February (0.13−13 leaves) during 2011 and 2012, respectively, which reached a peak population in the 1st week of June (3.97 and 3.03−13 leaves, respectively), and thereafter declined gradually till the end of the crop. Mites were first observed only from the 2nd week of March, and reached their peak in the 2nd and 1st week of June in 2011 and 2012, respectively. The coccinelid predator first appeared in the 3rd and 4th week, and reached a peak in the 3rd week of July and 3rd week of June (1.77 and 2.13−1plant) in 2011 and 2012, respectively. Chrysoperla was first observed from the last week and 3rd week of March and maintained a low population throughout. Correlation of seasonal incidence with maximum and minimum temperature, and morning and evening relative humidity revealed a positive relationship in case of leafhoppers, whiteflies, mites, coccinellids and Chrysoperla. Only the aphids had negative and non significant relationship with most weather parameters.

Influence of Spirotetramat 150 OD on the Incidence of Sucking Pests and Natural Enemies in Bt and Non-Bt Cotton

The effect of spirotetramat 150 OD (insecticide) application on sucking pests (whitefly, aphids, thrips and mealy bug) and predators (spiders, coccinellids and chrysopids) was investigated in transgenic Bt cotton and non-transgenic cotton agroecosystems at Tamil Nadu Agricultural University, Coimbatore. Transgenic cotton did not cause changes in population of pests and did not reduce number of predators considerably. Pesticide application decreased number of whitefly, aphid and mealy bug population significantly on both transgenic and non-transgenic cotton plants. Reduction in the population of predators was observed immediately after application. Later the population of predators started increasing gradually. However the population was found to be less than that of untreated plots. The result revealed that, transgenic Bt cotton did not affect sucking pest populations and did not cause considerable reduction in predator populations. The performance of spirotetramat on the incidence of sucking pests and abundance of natural enemies was similar on both Bt and non Bt cotton.