TY - JOUR
T1 - Comparative testing of several juvenile hormone analogues in two species of locusts, Locusta migratoria migratorioides and Schistocerca gregaria
AU - Pener, M. P.
AU - Ayali, A.
AU - Kelmer, G.
AU - Bennettova, B.
AU - Nemec, V.
AU - Rejzek, M.
AU - Wimmer, Z.
PY - 1997
Y1 - 1997
N2 - Effective treatment with juvenile hormone analogues (JHAs) of early penultimate or early last-instar locust hoppers induces a supernumerary 'extra' nymphal instar. These 'extra' nymphs, also termed 'adultoids', die in the course of, or shortly after, an 'extra' moult. Less effective treatment results in imperfect adults with crumpled twisted wings which presumably limit their flight and migratory abilities. Extremely effective treatment leads to death in the next moult. Comparing dose-response relations of (7S)-methoprene, fenoxycarb, pyriproxyfen and a new JHA, R70-1 (ethyl cis-N-{2-[4-(2-hydroxycyclohept-1-ylmethyl)phenoxy]ethyl}carbamate), we revealed that route of administration, instar of the recipient hopper, and species may alter over 1000-fold the ED50 for the same JHA. Locusta migratoria migratorioides is much more susceptible to JHAs than Schistocerca gregaria. The lowest ED50 found to induce adultoids and subsequent death in the 'extra' moult was 0.12 μg pyriproxyfen injected in olive oil to early penultimate instar hoppers of L. m. migratorioides (about 0.5 μg g-1 fresh weight). R70-1 was more active than pyriproxyfen following the more practical topical application to early last-instar hoppers of L. m. migratorioides, 5.9 μg and 46 μg per hopper, respectively (about 10 μg g-1 and 78 μg g-1 fresh weight). The high susceptibility of last-instar L. m. migratorioides nymphs to topically applied R70-1 is promising from the practical standpoint.
AB - Effective treatment with juvenile hormone analogues (JHAs) of early penultimate or early last-instar locust hoppers induces a supernumerary 'extra' nymphal instar. These 'extra' nymphs, also termed 'adultoids', die in the course of, or shortly after, an 'extra' moult. Less effective treatment results in imperfect adults with crumpled twisted wings which presumably limit their flight and migratory abilities. Extremely effective treatment leads to death in the next moult. Comparing dose-response relations of (7S)-methoprene, fenoxycarb, pyriproxyfen and a new JHA, R70-1 (ethyl cis-N-{2-[4-(2-hydroxycyclohept-1-ylmethyl)phenoxy]ethyl}carbamate), we revealed that route of administration, instar of the recipient hopper, and species may alter over 1000-fold the ED50 for the same JHA. Locusta migratoria migratorioides is much more susceptible to JHAs than Schistocerca gregaria. The lowest ED50 found to induce adultoids and subsequent death in the 'extra' moult was 0.12 μg pyriproxyfen injected in olive oil to early penultimate instar hoppers of L. m. migratorioides (about 0.5 μg g-1 fresh weight). R70-1 was more active than pyriproxyfen following the more practical topical application to early last-instar hoppers of L. m. migratorioides, 5.9 μg and 46 μg per hopper, respectively (about 10 μg g-1 and 78 μg g-1 fresh weight). The high susceptibility of last-instar L. m. migratorioides nymphs to topically applied R70-1 is promising from the practical standpoint.
KW - Fenoxycarb
KW - Juvenile hormone analogues
KW - Locusta migratoria
KW - Methoprene
KW - Pyriproxyfen
KW - Schistocerca gregaria
UR - http://www.scopus.com/inward/record.url?scp=0031448751&partnerID=8YFLogxK
U2 - 10.1002/(SICI)1096-9063(199712)51:4<443::AID-PS631>3.0.CO;2-4
DO - 10.1002/(SICI)1096-9063(199712)51:4<443::AID-PS631>3.0.CO;2-4
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AN - SCOPUS:0031448751
SN - 0031-613X
VL - 51
SP - 443
EP - 449
JO - Pesticide Science
JF - Pesticide Science
IS - 4
ER -