Acaricides used in conventional and organic citrus orchard: leprosis and phytoseiid mites population control

The citrus leprosis control in São Paulo state is performed exclusively by acaricides to control the vector mite, Brevipalpus phoenicis, which increases the production costs and may affect the beneficial organism's population. Therefore, the aim of this trial was to evaluate during four seasons, the effects of acaricides recommended to control the mite B. phoenicis in conventional and organic citrus over evolution of citrus leprosis and over phytoseiids' population. The experiment was installed in October of 2003 in a citrus orchard in Reginopolis city, state of São Paulo. The experimental design used randomized blocks, the dosages was expressed as mL c.p./100L of water and the treatments were the following: spirodiclofen (20 mL); cyhexatin (50 mL) (used in rotation), lime sulfur (4,000 mL) and control (without pesticide application). However, the rotation between spirodiclofen and cyhexatin began in September 2006. Prior to that time, only spirodiclofen had been used. Surveys were conducted every 15 days on the B. phoenicis, Iphiseioides zuluagai, and Euseius populations. The control level adopted by the B. phoenicis was 8.3%, and the pesticide applications were conducted using tractor-sprayers. During the 2007-08 seasons, 10 infected fallen fruits per plot were collected and the number of leprosis lesions was quantified by each fruit. By the end of the 2007-08 seasons, the productivity, harvest losses, the disease incidence and severity were evaluated. It was found that the lesions' location over the fruit is more important in determining its drop than the lesions' number. The more intense the mite infestation, the greater is the number of lesions, resulting in increased premature fruit drop. A strategy using acaricides spirodiclofen and cyhexatin in rotation promoted more efficient control of B. phoenicis compared to lime sulfur, resulting in greater productivity, lower fruit losses and severity levels. The lime sulfur applications reduced the mite population incidence below the control level; however it did not prevent the lesions' occurrence. The acaricides applicarevented adverse effects on phytoseiid population because there was a reduction of their density.

Tramas do impedimento: os sentidos da desistência entre Alfabetizandos da EJA

For young people and adults that have not yet conquered reading and writing, being literate is the most important thing in life , a dream . Scholarly learning for them is like hegemonic knowledge in contemporary literate society. Thus, for them to get into school is to be able to have such knowledge and, through it, feel inserted into this society. However, along this process of learning, they start to drop out, little by little, statistically increasing the number of people who give up on young people and adult education Eja, as well as slowly reducing the contingent of illiteracy in the country. With this reality as a starting point, we question the concrete and symbolic reasons or motives that lead to a dropping out of the literacy classes at Eja. To do so, we have established, as the object of our study, the feelings of giving up among those involved in young people and adult literacy training. To understand such feelings is our purpose in this investigation. The theory of Social Representations (MOSCOVICI, 1978, 2004) was the theoretical-methodological option for subsidizing data search, analyses and interpretation, making us perceive the significance of the object of this study for these individuals. The gathering of such symbolic content involved the use of semi-structured interviews with eleven drop-outs and ten students who had repeated this modality of teaching in public schools in Natal, RN, during the 2006 school year. From the thematic and categorical analyses (BARDIN, 1977), we identified elements that gave support to some themes. Later, these themes led to three categories, suggesting that feelings associated with dropping out were based on the following: learning difficulties because they did not understand the contents; having their lack of knowledge exposed, thus bringing forth feelings of shame, humiliation, and embarrassment for not knowing how to read and write at a mature age; work, tiredness and sickness. The students who manage to remain in school are those who force themselves to live with the feelings of maladaptation and those who develop a sense of adaptation the other way round to the institution, that is, acceptance of institutional failures and omissions

Acceleration of the decomposition of Sicilian lemon leaves as an auxiliary measure in the control of citrus black spot

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Acaricidas utilizados na citricultura convencional e orgânica: manejo da leprose e populações de ácaros fitoseídeos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)