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Related invasive species

  • Idioscopus clypealis
Biological Control
To date there have been few studies where biological control has been attempted against mango leafhoppers, despite the existence of parasitoids and predators (see Natural Enemies). Several fungal pathogens may prove useful for biological control as mentioned by Kumar et al. (1983).<br>Host-Plant Resistance<br>Presumably because of the time needed to grow mango trees large enough to test, there have been relatively few studies devoted to varieties resistant to attack by mango leafhoppers. Murthi and Abrahim (1983) investigated 12 mango varieties for population fluctuations of the hoppers during preflowering and postflowering periods by means of monthly sweeps of trees of uniform age. Progeny production by I. niveosparsus on floral branches was positively associated with the nitrogen content of the branches. Khaire et al. (1987) screened 19 varieties under field conditions for resistance to I. clypealis.
Has Cabi datasheet ID
28470
Detection

Detailed examination of the flower panicles is needed to determine the population size for damage assessment and control studies. Verghese et al. (1985) developed a sequential sampling plan for classifying infestation of I. clypealis into light, moderate and severe on the basis of sample counts. Negative binomial distributions for nymphs and adults were fitted. Operating characteristic values, giving the probability of reaching a correct decision for a range of population means for both adults and nymphs, together with average sample number values, were used to predict the average number of trees to be sampled under different sequential plans. In the case of the closely related I. niveosparsus, studies by Tandon et al. (1989) on the spatial distribution of nymphs on mango trees in Karnataka, India, to determine a sampling plan for the pest showed that nymphs were aggregated on the mango panicles. Their distribution was best explained by Iwao's patchiness regression which showed that mean colony size was fixed and that colonies followed a negative binomial series. The optimum sample size recommended was 59 panicles per tree for damage assessment and control studies, and 98 panicles per tree for ecological studies when greater precision was required. Tandon et al. (1989) found no significant differences in the distribution of nymphs between the north, south, east or west portions of the tree or between the upper and lower canopies, indicating that sampling can be conducted from any point on the tree.

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