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Nagano-shi, Japan

Adati T.,Tokyo University of Agriculture | Kato S.,Tokyo University of Agriculture | Toriumi W.,Tokyo University of Agriculture | Toriumi W.,Agro Kanesho Co. | And 7 more authors.
Applied Entomology and Zoology | Year: 2013

The efficacy of synthetic female sex pheromone lures for Crocidolomia pavonana (Fabricius) (Lepidoptera: Crambidae) in the cabbage fields of Java and Bali, Indonesia, was investigated by varying the composition and dosage of the components. The lure containing a synthetic pheromone blend of (Z)-11-hexadecenyl acetate (Z11-16: Ac) and (Z)-9-tetradecenyl acetate (Z9-14: Ac) at a 10:1 ratio acquired significantly more male catches than single component lures and the control lure. Meanwhile, no attraction was observed when lures with 1:1 and 1:10 blends were tested. The composition of Z11-16: Ac and Z9-14: Ac at a ratio of 5, 10 and 20:1 attracted more males than the control lures. Dosage studies showed that 0. 055 and 0. 55 mg of a mixture of Z11-16: Ac and Z9-14: Ac (10:1 ratio) attracted more males than the control. These results are the first demonstration of the efficacy of synthetic pheromone for C. pavonana in field conditions. The present study suggests the feasibility of pheromone-based monitoring as a simple and low-cost technique for integrated pest management of this pest. © 2013 The Japanese Society of Applied Entomology and Zoology. Source


Shintani Y.,Minami Kyushu University | Kawazu K.,Kyoyu Agri Co. | Hirose Y.,Minami Kyushu University
Entomological Science | Year: 2015

The hibiscus caterpillar, Xanthodes transversa (Lepidoptera: Noctuidae), is a multivoltine insect that is an important pest of Malvaceae plants such as the okra, Abelmoschus esculentus, and the common rose mallow, Hibiscus mutabilis, in Japan. In the present study, the effects of photoperiod and temperature on the induction of prepupal diapause and the adaptive significance of this diapause were examined in a local population of X.transversa in Miyazaki, Kyushu, southwestern Japan. Larvae showed a long-day photoperiodic response for controlling the induction of prepupal diapause with a critical day length between 13 and 14h at 20 to 25°C. Under long-day conditions larvae rapidly pupated from the sixth instar, but under short-day conditions they entered diapause in the prepupal stage. Diapause occurrence in the field increased in late September, which was consistent with the laboratory results in terms of the photoperiodic response. Non-diapause development after this time is maladaptive because most larvae of the next generation could not reach the critical stage (prepupae) before winter and died during early winter in outdoor experiments. Larvae suffered from a high rate of mortality when fed leaves collected late in autumn. The photoperiodic response for controlling the induction of diapause in this insect may play an important role in synchronizing the life cycle with the seasonal changes in food and temperature conditions. © 2015 The Entomological Society of Japan. Source


Yamamura T.,Ishikawa Prefectural University | Yamamura T.,Kyoyu Agri Co. | Nakagawa H.,Japan National Agriculture and Food Research Organization | Ebitani T.,Forestry and Fisheries Research Center | Tsukaguchi T.,Ishikawa Prefectural University
Japanese Journal of Crop Science | Year: 2013

The occurrence of milky white kernels is induced by high temperature and limited assimilate supply. The ring-type milky white kernels is induced mainly by a limited assimilate supply whereas the center-type milky white kernels is induced by a high temperature. The objective of this study was to select lines with a low percentage of milky white kernels from Koshihikari/ Kasalath chromosome segment substitution lines (CSSLs) and to determine whether they show a low percentage of milky white kernels under conditions of high temperature and limited assimilate supply. In 2006 and 2007, 36 CSSLs were grown in the field and the percentage of milky white kernels was compared with that in Koshihikari. SL204 and SL236 had a lower percentage of milky white kernels and were selected for the experiments. In 2008 and 2010, these lines and Koshihikari were grown in the field, and in 2008, leaf clipping treatment and thinning treatment were given to change assimilate supply. In 2009, high temperature treatments were given to the pot-grown plants using a temperature gradient chamber. We examined the percentage of milky white kernels in each year, grain yield in 2008 and 2010 and assimilate availability in 2008. SL204 and SL236 had a lower percentage of milky white kernels than Koshihikari under a high temperature and limited assimilate supply conditions. Under high temperature condition, the percentage of center-type, and under a limited assimilate supply, the percentage of ring-type milky white kernels were low. The lower percentage of ring-type milky white kernels was attributed to the higher assimilate supply in SL204 and the lower supply of assimilate required to prevent the occurrence of ring-type milky white kernels in SL236. © 2013 by The Crop Science Society of Japan. Source


Kawazu K.,Japan National Institute for Agro - Environmental Sciences | Kawazu K.,Kyoyu Agri Co.
Applied Entomology and Zoology | Year: 2014

In this study, I tested an artificial diet, Insecta LFS, for rearing the 28-spotted ladybird beetle, Henosepilachna vigintioctopunctata (Fabricius). H. vigintioctopunctata larvae could not be reared through all of the larval stages on the artificial diet. However, initially they could be reared on tomato leaves up to the second or third instar, and thereafter exclusively on the artificial diet. The larval and pupal periods were not significantly different from those reared only on tomato leaves. For females reared by the diet-switching method, the preoviposition period was significantly longer and the number of eggs laid significantly lower than for those on tomato leaves. However, these differences did not become a hindrance to laboratory rearing. This rearing method saves labor involving obtaining fresh plant leaves and produces a reliable supply of the insects. © 2014 The Japanese Society of Applied Entomology and Zoology. Source


Kawazu K.,University of Tokyo | Kawazu K.,Kyoyu Agri Co. | Shintani Y.,Minami Kyushu University | Tatsuki S.,University of Tokyo
Applied Entomology and Zoology | Year: 2014

To clarify whether multiple mating of females and males affects the reproductive performance of the rice leaffolder moth, Cnaphalocrocis medinalis (Guenée), we examined the effect of the number of matings (once, twice, or three times) for females (female treatment) and males (male treatment) on the incidence of moth mating, number of eggs laid, egg hatchability, and adult longevity. We also compared the effect of multiple mating imposed on males or females separately with the effect of that imposed on both sexes simultaneously (both sexes treatment). The incidence of mating of females and males that mated three times (3-mated females and males) was significantly lower than for females and males that mated twice or once (2-mated or 1-mated females and males). The incidence of mating of 1-mated moths (both sexes) was significantly higher than for 2-mated or 3-mated moths (both sexes). Two-mated or 3-mated females laid significantly more eggs with significantly higher hatchability than 1-mated females. Females that mated with 1-mated males (second male mating) or 2-mated males (third male mating) laid significantly fewer eggs than those that mated with virgin males (first male mating). Females laid significantly more eggs after the second and third matings for moths of both sexes than after the first mating for moths of both sexes. The mechanisms of improvement and decline of female reproductive performance when multiple mating was imposed on males or females are also discussed in relation to the reproductive biology of C. medinalis. © 2014, The Japanese Society of Applied Entomology and Zoology. Source

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