The Effects of Some Botanical Insecticides and Pymetrozine on Life Table Parameters of Silver Leaf Whitefly Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae)
Efekat nekih botaničkih insekticida i pimetrozina na životne parametre leptiraste vaši duvana Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae)
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Author
Barati, Reihaneh
Golmohammadi, Gholamreza
Ghajarie, Hamid
Zarabi, Mehdi
Mansouri, Raziyeh
Keywords
BotanicalsPymetrozine
Bemisia tabaci
Life tables
Botanički insekticidi
pimetrozin
tablice života
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Show full item recordAbstract
The objective of this research was to assess the effects of extracts of two medicinal
plant species: Allium sativum (Linn) and Calotropis procera (Aiton), and a formulation containing
azadirachtin on life table parameters of silver leaf whitefly (SLW), Bemisia tabaci biotype
B (Gennadius) (Hemiptera: Aleyrodidae), grown on greenhouse tomato plants. The
effects were compared to that of pymetrozine, a synthetic insecticide. Bioassays were carried
out in a greenhouse under controlled conditions of 27 ± 2°C, R.H. of 55 ± 5% and 16:8
h (L:D) photo period.
All treatments significantly affected the survivorship and fertility of SLW female adults,
reducing the net reproduction rate, mean generation time and intrinsic rate of increase of
this insect.
The net reproductive rate [R0] values for the populations treated with garlic extract,
milkweed extract, pymetrozine, azadirachtin, control for extracts (ethanol + distilled water)
and control for pesticides (distilled water) were 23.58, 19.32, 10.78, 8.23, 49.66, 57.55; the
intrinsic rate of increases [rm] were 0.134, 0.139, 0.110, 0.090, 0.177, 0.178; the mean generation
times [T] were 23.49, 21.23, 21.66, 23.50, 22.06, 22.69; the doubling times [DT] were 5.14,
4.95, 6.27, 7.56, 3.91, 3.87, and the finite rates of increase [λ] were 1.144, 1.149, 1.116, 1.094, 1.193,
1.195, respectively. Azadirachtin had the highest effect on the life table parameters of SLW.
Our findings indicated that, although herbal extracts were not effective as much as
the chemical insecticides, they can be effective in pest control. Therefore, they are suitable
choices for replacing chemical insecticides and for alternative use with azadirachtin in
SLW IPM program. Cilj ovog istraživanja bio je da se proceni delovanje ekstrakta dve lekovite biljne vrste,
Allium sativum (Linn) i Calotropis procera (Aiton), kao i formulacije azadirahtina na životne parametre
leptiraste vaši duvana Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) gajene
na biljkama paradajza u stakleniku. Delovanje je upoređeno sa sintetičkim insekticidom pimetrozinom.
Biotest je urađen u stakleniku pod kontrolisanim uslovima, na temperaturi od
27 ± 2°C, pri relativnoj vlažnosti 55±5% i sa fotoperiodom 16:8 h (D:N).
Svi tretmani su imali značajan uticaj na preživljavanje i plodnost odraslih ženki leptiraste
vaši duvana, smanjujući neto stopu reprodukcije, srednje vreme generacije i prirodnu stopu
rasta ovog insekta.
Vrednosti neto stope reprodukcije [R0] za populaciju tretiranu ekstraktom belog luka,
ekstraktom kalotropisa (sodomske ili mrtvomorske jabuke), pimetrozinom i azadirahtinom,
kao i kontrolom za ekstrakte (etanol + destilovana voda) i kontrolom za pesticide (destilovana
voda) bile su 23,58; 19,32; 10,78; 8,23; 49,66; 57.55; vrednosti prirodne stope rasta [rm]
su bile 0,134; 0,139; 0,110; 0,090; 0,177; 0,178; srednje vreme generacije [T] bilo je 23,49; 21,23;
21,66; 23,50; 22,06; 22,69; vreme udvostručenja [DT] 5,14; 4,95; 6,27; 7,56; 3,91; 3,87; i konačna
stopa rasta [λ] 1,144; 1,149; 1,116; 1,094; 1,193; 1,195; respektivno. Azadirahtin je imao najveće
dejstvo na životne parametre leptiraste vaši duvana.
Rezultati ispitivanja su pokazali da biljni ekstrakti, iako nisu imali izraženo delovanje kao
hemijski insekticidi, mogu biti efikasno upotrebljeni u suzbijanju štetnih insekata. Otuda su
oni pogodni kao alternativa hemijskim insekticidima, a mogu se upotrebiti i sa azadirahtinom
u integralnom upravljanju leptirastom vaši duvana.