PNABD246.pdf

Field trials were conducted to assess the effect of beanfly, Ophiomyla
phaseoli (Tryon) (Diptera: Agromyzidae) on crop losses in four legumes;
Phaseolus vulgaris, Vigna radiata, V. sesquipedalis and Glycine max. In the
absence of chemical control 65% of P. vulgaris seedlings were killed one month
after seeding. Among the five insecticides tested to control the beanfly,
dimethoate was most effective giving significant yield (P less than 0.05)
increase. The nature of damage by the pest is discussed. [AS]
*0693 Burikam, I. 1978. Ecological investigation on the bean fly, Ophiomyla
phaseoli (Tryon) (Diptera: Agromyzidae), and its natural enemies in Thailand.
Bangkok : Kasetsart University. 7 1p. [En] [En Abst] (Thesis - M.Sc.)
(SB945.L55B8)
In Thailand the most important natural enemies of the bean fly, Ophiomyia
phaseoli, were Plutarchia sp. and Biosteres sp. Other less important natural
enemies included a eulophid, a pteromalid, a cynipid and a species each of
nematode and ant. Under laboratory condition, 0. phaseoli was capable of laying
77.12 [plus or minus] 21.56 eggs during an oviposition period of 13.36 [plus or
minus] 3.17 days. Larvae moulted 3 times and the total larval stage was 7.37
[plus or minus] 0.49 days. The growth increment of larvae based on the length
of cephalopharyngeal apparatus followed Dyar's Law with the mean geometric
ratio of 1.882. The pupal stage averaged 7.76 [plus or minus] 0.73 days. The
longevity of male and female adults were 7.13 [plus or minus] 2.39 and 15.42
[plus or minus] 3.78 days, respectively. Life cycle from egg to adult stage was
18.45 [plus or minus] 0.76 days. The analysis of the life tables of 0. phaseoll
revealed the followed population statistics: the net reproductive rate of
increase (Ro) = 16.92, the capacity for increase (rc) = 0.101, the cohort
generation time (Tc) = 28.001 days, and the finite rate of increase [lambda]
1.106. The population study of 0. phaseoli indicated that 0. phaseoli attacked
mungbean, during seedling stage and began to move out at the end of the
vegetative stage prior to flowering. The analysis of the population density
found that there was a density-dependent factor regulating the population. The
biological study of the larval-pupal parasite, Plutarchia sp., revealed that
life cycle from egg to adult emergence was 17.47 [plus or minus] 0.92 days. The
femal adult developed 9.32 [plus or minus] 2.15 eggs per day. The life history
of Biosteres sp., a eulophid and a pteromalid was studied to a less extent. The
assessment and evaluation of Plutarchia sp. as a biological control agent
required additional investigation. This investigation could be employed for the
implementation of a pest management program for 0. phaseoli. [AS]
*0694 Lin, C.S. 1979. Varietal resistance of mung bean to the bean fly and
the other agromyzids. University of Hawaii. xi, 107p. (SB945.L55L5)
The beanfly (Ophiomyia phaseoli Tryon) was the most common species,
followed in abundance by Melanagromyza sojae Zehntner at the Asian Vegetable
Research and Development Center (AVRDC). Evaluating legumes in the genus Vigna
for resistance to the beanfly, the adzuki bean was the most susceptible and the
rice bean was the most resistant to attack. Scatter diagram of the resistance
and susceptibility of the test varieties to the beanfly damage on the basis of
standard deviation of the percent plant mortality, the nuwber of larvae and
puparia per plant, and the number of leaf punctures was nn effective method
used to categorize and evaluate the resistance and susceptibility of the test
varieties. Mungbean varieties were screened for resistance to the beanfly and
agromyzid leaf miner (Liriomyza spp.) at AVRDC, Taiwan and Waimanalo, Hawaii.
Three varieties (V 2533, V 2535, V 2545) were in the resistant category. The
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