CIGARRINHA DAS PASTAGENS PDF

Monthly mortality of diapausing eggs collected during the dry season June-September over 2 yr varied from 4. Groups of 20 eggs with fully developed embryos were chosen randomly and placed at the base of potted plants of B. Cigarrinha das Pastagens — Biofaces — Bring Nature Closer Plants under field conditions may provide better or worse conditions for nymphs survivorship because at microclimate or root size, and additional tests in the field are warranted. The evaluations were performed pastabens the beginning day 0and 15, 32, 45, 61 e and 75 days, being one evaluation before the applications, and five after the applications of this fungus, counting the spittlebugs nymphs per 0.

Author:Dasho Tazuru
Country:Grenada
Language:English (Spanish)
Genre:Software
Published (Last):13 September 2005
Pages:375
PDF File Size:17.6 Mb
ePub File Size:14.61 Mb
ISBN:270-6-18726-332-3
Downloads:51733
Price:Free* [*Free Regsitration Required]
Uploader:Arall



Monthly mortality of diapausing eggs collected during the dry season June-September over 2 yr varied from 4. Groups of 20 eggs with fully developed embryos were chosen randomly and placed at the base of potted plants of B.

Cigarrinha das Pastagens — Biofaces — Bring Nature Closer Plants under field conditions may provide better or worse conditions for nymphs survivorship because at microclimate or root size, and additional tests in the field are warranted. The evaluations were performed pastabens the beginning day 0and 15, 32, 45, 61 e and 75 days, being one evaluation before the applications, and five after the applications of this fungus, counting the spittlebugs nymphs per 0.

However, the occurrence of sparse and less frequent rainfall d of dampened soil followed by more than 16 d of droughtfollowing the second half of August, drastically increases mortality and reduces the chances of economically important population densities developing see also Pires et al. This research topic is little explored in the academic world, thus, this thesis contributes to the advancement of statistical View large Download slide.

A population study of the spittle bugs Aeneolamia occidentalis Walk. At the other extreme, 16 d of drought after ciyarrinha intense and frequent rain keeping the soil moist for 14 d maximize mortality in local populations of D. Feeding behavior of the spittlebug Deois flavopicta Homoptera: The average time for egg hatch in all treatments Fig.

Receive exclusive offers and updates from Oxford Academic. The last egg patsagens in this group allowed the estimation of the time necessary under moist conditions to induce all eggs of a population to start final embryonic development. In this work the efficacy the fungus of applied at in twice formulations dqs emulsifiable oil and wettable powdertrhee doses 1,0 x, 1,5 x, 2 x viable conidias ha-1 in once for twice during the pest infested with period.

Nymphs that emerged under condition 1 were considered representative of the group that started final embryonic development and then died under condition 2, and did not emerge under condition 3. Inimigos naturais encontrados na regiao de Campo Grande, MS. Plastic panels containing adesive trap were used to monitorate the movement rates.

After the dry season, postdiapause eggs remain quiescent waiting for favorable conditions to hatch Pires et al. The low mortality rates of eggs observed during the middle of the dry season July and August indicate that lack of moisture and warm soil do not preclude outbreaks of D.

A number of studies have confirmed the low response of diapausing eggs to environmental factors during the dry season in June and July Sujii et al. Modeled and observed curves of hatching proportion were compared using the Kolmogorov-Smirnov test Wilkinson Empty chorions were excluded. Following this dry period, eggs were again transferred to moist conditions condition 3as described above for condition 1, until hatching ciyarrinha quiescent eggs or death of all individuals.

For the treatments longer than 2 d, this layer was moistened dass other day to ensure continuous contact between water and eggs. Each treatment had eight replications. Publications Print Add to your cart remove More searches Search for this title in: For commercial re-use, please contact journals. The volume of the solution utilized was liter ha-1 with sprayer.

Although mortality rates varied from 4. Periods of drought and high temperatures after the beginning of postdiapause development increased embryonic and nymphal mortality. D h until the emergence of nymphs. At the beginning of September, when the eggs naturally enter the postdiapause or quiescence without any token stimuli Pires et al. Se ensayaron 6 insecticidas para evaluar el grado de eficiencia en el control de Deois incompleta, principal plaga de los pastos en la Amazonia.

Natural infertility of eggs 0. The proportion of postdiapause eggs starting final embryonic development increased as a consequence of exposure to increasing periods of moisture in condition 1 Fig. The base of the cage was buried 10 cm deep to impede the entrance of paetagens insects from beneath.

Cohorts of 50 eggs were placed in a cm-diameter petri dish containing a layer of cotton covered with moist filter paper. Such eggs die when faced with drought conditions, but they were still found in the June-July soil samples.

Cohorts of quiescent eggs, when exposed to increasing periods of high moisture free waterproduced higher proportions of eggs resuming embryonic development in laboratory experiments. TOP Related Posts.

CALCULO Y GEOMETRIA ANALITICA GEORGE SIMMONS PDF

CIGARRINHA DAS PASTAGENS PDF

Arashizilkree Newly emerged first instars of spittlebug move directly to the nearest suitable plant and establish themselves at the base of stems and exposed roots, where they immediately start feeding and producing spittle Pires et al. View large Download slide. Because egg mortality was due to either low moisture lack of contact with free water or infertility, the average rate of infertility in the control cgiarrinha Plants under field conditions may provide better or worse conditions for nymphs survivorship because at microclimate or root size, and additional tests in the field are warranted. The data suggest a lack of pattern related to the geographical position of the traps. Cigarrinha-das-pastagens Pasture planthopper Cages consisted of cylindrical iron frames 0.

BIOLOGY OF THE INVERTEBRATES PECHENIK PDF

As melhores formas de controle para cigarrinha-das-pastagens

Tejas Comparing the means among the treatments, using the Kruskal-Wallis ANOVA, we tested if ckgarrinha exposure to moisture condition 1 could be initiating embryonic development in some eggs that then wait for condition 3 to resume embryonic development. Following this dry period, eggs were again transferred to moist conditions condition 3as described above for condition 1, until hatching of quiescent eggs or death of all individuals. Inimigos naturais encontrados na regiao de Campo Grande, MS Teste de insecticidas para controle da cigarrinha-das-pastagens Deois incompleta Walk Evidencias de acao inibidora da jurema-preta na fermentacao in vitro de gramineas forrageiras Potencial de la leucaena Leucaena leucocephala Lam. Although mortality rates varied from 4. Time taken for eggs of D. The average time for egg hatch in all treatments Fig. A control set of eight pots was kept under daily irrigation throughout the experiment.

ELEKTRONIKA ELEKTROTECHNIKA DLA NIEELEKTRYKW PDF

.

Related Articles