POPULASI DAN TINGKAT SERANGAN HAMA KUTU PUTIH Dysmicoccus brevipes (Hemiptera : Pseudociccidae) PADA TANAMAN JAHE (Zingiber officinalle Rosc) DI DESA NUAMURI KECAMATAN KELIMUTU

This study aims to determine the population and level of attack of mealybug pests on ginger plants during harvesting in Nuamuri Village, Kelimutu District, Ende Regency. This research was carried out from February 2020 to July 2020, in Detubewa village, Nuamaro village and Nuamuri village. Observations were made by directly counting pests and damaged and attacked rhizomes, using the path method. Data analysis used is data obtained from the location of observations in tabulation based on the results of direct observations in the field. What was observed was the population and attack rate of each affected ginger planting location. The results showed that during the observation, the highest population of mealybugs was found in Detubewa village with 2,645 heads and the lowest value was in Nuamaro village, namely 2,127 heads, the highest pest population after Detubewa village was village Nuamuri with 2,478 individuals. Meanwhile, the attack rate and presentation of very heavy attacks were in Detubewa village by 84%, and heavy attacks in Nuamuri village at 66% and Nuamaro village at 68%.

Prevalence of Dysmicoccus brevipes (Cockerell, 1893) (Hemiptera: Pseudococcidae) in MD2 pineapple crop areas in Colombia

ABSTRACT Pineapple mealybug wilt has been reported as one of the most important diseases affecting pineapple crops worldwide. This study aimed to determine the prevalence of mealybugs associated with two agroclimatic zones of pineapple production in the department of Valle del Cauca, Colombia. The survey was conducted in the upper (Dagua, Restrepo, La Cumbre and Vijes) and lower (Buga and Palmira) land zones. A total of 75 MD2 pineapple plots in different development growth stages were evaluated. The mealybugs were recorded mainly in the upper land zone, with a prevalence of 32 %. Concerning the plots growth stages, the highest prevalence was observed in second-cycle plots (13.3 %), followed by third-cycle ones, including abandoned plots (9.3 %), and first-cycle plots (6.7 %), which were associated with the use of pesticides. Dysmicoccus brevipes was the only mealybug species (Pseudococcidae) found on pineapples in the study area.

Host plants for mealybugs (Hemiptera: Pseudococcidae) in grapevine crops

ABSTRACT Mealybugs (Hemiptera: Pseudococcidae) are considered pest insects of economic importance in grapevine crops. They are highly polyphagous, feeding on host plants of about 250 families. This study aimed to identify host plants for mealybugs in grapevine crops, in the São Francisco Valley region, Brazil. The samples included weeds, ornamentals, windbreaks, fruit trees and native plants of the Caatinga biome. A total of 37 species of host plants for mealybugs were identified, distributed in 18 families. The Malvaceae family was the most frequent one, with eigth host species identified, followed by Fabaceae with four and Euphorbiaceae with three. Most of these host plants are being recorded here for the first time in association with mealybugs species. From the identified plant species, 24 are hosts for Maconelicoccus hirsutus, 16 for Phenacoccus solenopsis, one for Ferrisia virgata, one for Dysmicoccus brevipes and one for Planococcus citri. The obtained results are important to better understand the host plant diversity for mealybugs, in order to implement integrated pest management programs.

Impact of different pineapple mealybug densities in a peanut crop

The pineapple mealybug Dysmicoccus brevipes (Hemiptera: Pseudococcidae) is a cosmopolitan and polyphagous species that causes severe damage to peanut crops in many countries around the world. This work was conducted in Campina Grande, Paraíba Sate, Brazil, aiming to assess losses in productivity caused by D. brevipes in a peanut crop. A completely randomized design with five treatments and four replicates was used. Treatments consisted of five mealybug population densities (nymphs and adults) on peanut roots and pods, described as follows: T1 = 0 mealybugs per plant; T2 = 1 to 20 mealybugs per plant; T3 = 21 to 40 mealybugs per plant; T4 = 41 to 80 mealybugs per plant and T5 = more than 80 mealybugs per plant. Roots and pods infested with the pest were observed on 84 % of the peanut plants sampled, ranging from zero to 147.1 individuals per plant. The higher the number of mealybugs per plant, the lower the weight of pod. The mean pod productivities of BR1 peanut cultivars, with the highest and lowest densities of mealybugs per plant were 1,695 and 3,290 kg per ha, respectively. Fields heavily infested with D. brevipes risk significant losses due to the enormous capacity of this organism for causing damage.