THE VIRULENCE CHANGE AND DAMAGE CHARACTERISTICS OF VARIOUS GEOGRAPHIC POPULATIONS OF BROWN PLANTHOPPER*
4
Citation
1
Reference
10
Related Paper
Citation Trend
Abstract:
Abstract The virulence change and damage characteristics of brown planthopper (BPH), Nilaparvata lugens Stal, populations collected from Guangxi, Yunnan and Zhejiang Provinces were studied by using various resistant rice varieties. The results indicated that the Zhejiang population could successfully infest varieties IR26 and Mudgo, showing the characters of BPH biotype 2 after 1989. The Guangxi population, however, could adapt the resistant varieties IR26, Mudgo and ASD7 after 1991. In 1997, the nymphal survival indices of Guangxi and Yunnan populations on Rathu Heenati ( Bph3 ) were up to 70. 9 and 66. 7 respectively. This may imply that the BPH populations in Guangxi and Yunnan have shifted into a new biotype. In free‐choice test, there was obvious difference in the feeding preference of nymphs and adults of Zhejiang population, the adult preferred to feeding on resistant variety IR26 and the nymphs chose the hosts randomly. Under 26 C and L12: D12, the nymphal duration of Zhejiang population was the longest in the three tested populations. For Guangxi population, the nymphal duration on ASD7 was significantly longer than on TN1, although it could infest resistant variety ASD7. The nymphal survival rate of Zhejiang population fed on IR26 was higher than those fed on TN1 and ASD7. On varieties IR26 and ASD7, an obviously higher nymphal survival rate was observed in Yunnan population as compared to those of Zhejiang and Guangxi populations. These results indicate that difference in virulence and damage characteristics could be found in different geographical populations of BPH.Keywords:
Brown planthopper
Planthopper
Abstract The virulence change and damage characteristics of brown planthopper (BPH), Nilaparvata lugens Stal, populations collected from Guangxi, Yunnan and Zhejiang Provinces were studied by using various resistant rice varieties. The results indicated that the Zhejiang population could successfully infest varieties IR26 and Mudgo, showing the characters of BPH biotype 2 after 1989. The Guangxi population, however, could adapt the resistant varieties IR26, Mudgo and ASD7 after 1991. In 1997, the nymphal survival indices of Guangxi and Yunnan populations on Rathu Heenati ( Bph3 ) were up to 70. 9 and 66. 7 respectively. This may imply that the BPH populations in Guangxi and Yunnan have shifted into a new biotype. In free‐choice test, there was obvious difference in the feeding preference of nymphs and adults of Zhejiang population, the adult preferred to feeding on resistant variety IR26 and the nymphs chose the hosts randomly. Under 26 C and L12: D12, the nymphal duration of Zhejiang population was the longest in the three tested populations. For Guangxi population, the nymphal duration on ASD7 was significantly longer than on TN1, although it could infest resistant variety ASD7. The nymphal survival rate of Zhejiang population fed on IR26 was higher than those fed on TN1 and ASD7. On varieties IR26 and ASD7, an obviously higher nymphal survival rate was observed in Yunnan population as compared to those of Zhejiang and Guangxi populations. These results indicate that difference in virulence and damage characteristics could be found in different geographical populations of BPH.
Brown planthopper
Planthopper
Cite
Citations (4)
The population dynamics,wing and sex differentiation of the brown planthopper,Nilaparvata lugens(Stl),and the white- backed planthopper,Sogatella furcifera(Horvath),in late rice fields were investigated in detail from 2010 to 2011. The dominance index ofN. lugens was higher than that of S. furcifera in2010,but relatively lower in 2011. Both of the two species of planthopper could be founded in early June. The brown planthopper had an obvious seasonal peak in early- middle September,but the white- backed planthopper showed two density peaks in early July and in middle- late August,respectively. Generally,the brachypterous adult of the brown planthopper began to appear after that the macropterous adult moved into the late rice field,subsequently the density increased dramatically and exceeded the density of macropterous adult in late August in2010,but it didn't display obvious difference between the two kinds of wing forms in 2011. Most of the white-backed planthopper were macropterous,and the density of brachypterous planthopper was small during rice growth. The sex ratios of the two kinds of planthoppers were usually greater than or equal to 1. For N. lugens,its sex ratio increased with increasing density;but for S. furcifera,it fluctuated between 1 and 4. The analysis of binary linear regression equation showed that the percentage of brachypterous individuals and sex ratio increased with increasing population density of the brown planthopper,but there was not significant correlation between them.
Brown planthopper
Planthopper
Delphacidae
White (mutation)
Population density
Cite
Citations (1)
Twelve commercial insecticides in EC and WP forms at 0.025, 005, 0,075 and 0.10% ai, were evaluated against adults and nymphs of BPH separately using diazinon 0.05% as standard. Considering the overall persistent toxicity against adults and nymphs based on 'PT values and overall mean persistent toxicity, chlorpyrifos and carboturan 0.05% 1 as foliar sprays followed by quinalphos and monocrotophos are the most effective in the control of BPH in the field.
Brown planthopper
Quinalphos
Monocrotophos
Planthopper
Cite
Citations (1)
Comparison among the behavioral reactions of brown planthopper (BPH) Nilaparvata lugens Stal and white-backed planthopper (WBPH) Sogatella furcifera (Horvath) fed on four BPH-resistant (ASD7, IR36, JX89 and Mudgo) and one BPH-susceptible (TN1) rice varieties were conducted. BPH showed evident non-preference reaction to these resistant varieties, and there were significant differences between BPH (4th after inoculation)/WBPH (8th after inoculation) densities on resistant and susceptible varieties, while the planthopper densities on BPH-resistant varieties, except Mudgo, were similar. On the same BPH-resistant variety, the perference rate on WBPH were significantly higher than that of BPH. There was no time regularity of planthopper density on any rice variety. Both the feeding amounts of BPH and WBPH on resistant varieties were markedly lower than those on TN1, while in comparison with the feeding amounts of BPH on IR36/JX89, those of WBPH were obviously higher. Contrarily, the probing wound number of the two planthopper species on resistant rice varieties were much more than that on TN1, but those of WBPH on ASD7/JX89 were much less than those of BPH. Consequently, there is a negative correlation between the probing wound number and feeding amount of planthopper on any rice variety.
Planthopper
Brown planthopper
Delphacidae
White (mutation)
Rice plant
Cite
Citations (2)
Both brown planthopper and white back planthopper are important pests of rice. The spa- tial interactions between brown planthopper and white back planthopper, in different rice growing sea- sons, were studied using geoetatistical methods. It was shown that the main spatial interactions was no- interaction, but the positive and negative interaction occured in the 1st rice season, and the ranges were 18 m and 54 m. In the 2nd rice season, spatial interaction between brown planthopper and white back planthopper was negative interaction with a range of 54 m, and displayed different interactions with different directions.
Brown planthopper
Planthopper
White (mutation)
White rice
Brown rice
Cite
Citations (0)
Brown planthopper(BPH,Nilaparvata lugens)and whitebacked planthopper(WBPH,Sogatella furcifera)are two major pests of rice. The application of resistant cultivars have proven to be an effective way to control these two pests. To day,a great progress has been made in the field of exploitation and utilization of resistant resource to BPH and WBPH,and a number of resistance genes were identified or mapped in rice,which derived from cultival and wild relatives. The present paper reviews the recent advances in resistance genes mapping and QTL analysis to BPH and WBPH,and summarizes the utilization in rice breeding program by marker-assisted selection. The problems and prospects of gene mapping and its application are also discussed in this paper.
Planthopper
Brown planthopper
Cite
Citations (1)
Brown planthopper
Population density
Cite
Citations (0)
The life table and Morris-Watt mathematical model were used as the methods of comprehensive evaluation to analysis the resistance levels of 5 rice varieties to brown planthopper (BPH) Nilaparvata lugens Stal and whitebacked planthopper (WBPH) Sogatella furcyera Horvath. The results showed that variety IR36, Shanyou 6, Xieyou 10, Xiushui 620 and Bing 664 had significantly inhibiting effects on the population growth of BPH, but variety Xiushui 620, Bing 664 and Xieyou 10 were moderately resistant to WBPH. The results also indicated that the ovipositional stage of adults of both BPH and WBPH was the key stage on which the resistant varieties had the most adverse influence.
Brown planthopper
Planthopper
Rice plant
Cite
Citations (1)
Brown planthopper
Planthopper
Delphacidae
Rice plant
Cite
Citations (12)
Rice planthoppers,including the brown planthopper(BPH),Nilaparvata lugens,white-backed planthopper(WBPH),Sogatella furcifera and the small brown planthopper(SBPH),Laodelphax striatellus are key insect pests in the paddy-fields of China and many other countries.These species are r-strategists and tend to have periodic outbreaks.All three species are typically long-distance migrants and often simultaneously occur over a large geographic scale during outbreaks.The SBPH mainly overwinters locally and its long-distance migration has little impact on its population structure.However,its transmission of viruses to rice plants is more serious.Based on the biological characteristics of N.lugens,S.furcifera and L.striatellus,we developed methods and technologies for the surveying and sampling of these species that can improve the population monitoring and the forecasting of population outbreaks.
Brown planthopper
Planthopper
Delphacidae
Cite
Citations (2)